The periodic table
Grade 8 science worksheets, introduction.
All known, naturally occurring elements in the Universe, and some artificially created ones are represented in a standard format known as the Periodic Table .
The periodic table is composed based on the Periodic Law , which states that the properties of chemical elements recur in regular patterns when they are arranged according to their atomic weights. The periodic law was set forth by Russian chemist Dimitri Mendeleev.
The rows of the table are known as Periods and the columns are known as Groups . The elements are arranged in increasing order of their Atomic Number (which is the number of protons in the nucleus of the atoms of that element) from left to right and from top to bottom.
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The rows represent a period number, which is the number of energy levels of the atom. An element in the third row, such as sodium (Na), indicates that the electrons of the sodium atom orbit in three energy levels. Elements in subsequent rows have increasing energy levels of orbiting electrons.
The columns represent groups or families of elements which look or behave similarly. The elements in each group also have the same number of electrons in their outermost shell, known as the Valence Electrons , which determines their ability to participate in chemical reactions. Thus, elements in the same group have similar chemical properties. See also – Chemical Properties of Matter.
These metals mostly from the first group and are shiny, soft, and extremely reactive, bursting into flames or even exploding when they come in contact with water.
These form the second group. They are also soft, shiny, and quite reactive. They are found mostly in compounds and minerals, never in their natural form.
The groups 3 to 12 are hard, malleable, shiny, and good conductors of heat and electricity. These are the typical metals like zinc, gold, silver, iron, for example.
These span groups 13 to 17 and consist of the post-transition metals, such as aluminum, tin, and lead, which are poorer conductors of heat and electricity as compared to the transition metals.
Some of the elements in groups 13 to 17 are called Metalloids on account of their gradual transition from metals to non-metals.
The rest of the elements in groups 13 to 17 are non-metals such as carbon, sulfur, phosphorus, and oxygen. They include the Halogens in group 17 which are chemically reactive with alkali metals to form salts. Chlorine, fluorine, and iodine are some popular halogens.
The last group, 18, consists of colorless, odorless, and mostly non-reactive gases, also called Inert Gases . Helium, neon, argon are some examples of inert gases.
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Other Trends in the Periodic Table
There are many other trends observed in the periodic table apart from the atomic number, energy levels of orbiting electrons, number valence electrons, and the metallic character and chemical reactivity of the elements. One trend is the Atomic Size , which is measured by the Atomic Radius .
As the atomic number increases along any period, the additional electrons associated with this increase are packed into the same orbit or energy level of the atom. At this same energy orbit, the increased nuclear charge (due to addition of the proton) attracts the orbiting electrons much more strongly, making the size of the atom smaller along the row. Atomic radius of elements therefore decreases along any period.
As one moves down any group, the atomic radius increases due to an increase in the orbits of electrons. Atomicradius of elements increases in size as you move down a group.
- Elements in the periodic table are arranged in increasing order of their ______.
- The number of energy levels of orbiting electrons is the basis to arrange elements into _____.
- A group has elements with the same number of _____ in their outermost shells.
- Elements in groups 13-17 which gradually transition from metals to non-metals are called _______.
- Elements that are non-reacting gases are known as ______.
- Atomic Number
- Rows or Periods
- Noble gases or Inert gases
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Eighth Grade (Grade 8) Periodic Table and Elements Questions
You can create printable tests and worksheets from these Grade 8 Periodic Table and Elements questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.
- atomic number
- atomic weight
- mass number
- Oxygen is a halogen.
- Oxygen is a nonmetal.
- Oxygen is a noble gas.
- Oxygen is a rare earth element.
- according to atomic mass.
- according to atomic number.
- in alphabetical order.
- according to the number of neutrons in their nuclei.
- atomic mass
- chemical symbol
- All the elements are nonreactive.
- All the elements are in the same period.
- All the elements have the same number of protons.
- All the elements have similar chemical properties.
This question is a part of a group with common instructions. View group »
- in a figure eight.
- an element with an atomic number of 2 and an atomic mass of 4
- an element with an atomic number of 3 and an atomic mass of 7
- an element with an atomic number of 4 and an atomic mass of 9
- an element with an atomic number of 7 and an atomic mass of 14
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Periodic Table Year 8 Revision
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23 August 2019
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It's all about chemistry, periodic table worksheets.
The periodic table consists of natural and artificial elements arranged in increasing atomic numbers. Several properties like the atomic number, atomic mass, chemical symbol of the element, and oxidation states are listed in the periodic table. These worksheets test students’ knowledge of periodic table elements and their properties, like the atomic number and valance electrons.
Suitable for: Grade 5, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10
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Periodic Table Worksheets
Know your periodic table soup to nuts with our periodic table worksheets. A tabular display of chemical elements, the periodic table helps students feel at home with chemical elements and keeps them thoroughly and immaculately informed of the atomic numbers, electronic configurations, and chemical properties of elements. This promising set of printable worksheets for grade 5 through grade 8 includes a color-coded periodic table chart, completing the periodic table and identifying periodic table families, completing the missing parts in a table, a periodic table MCQ, and more. One of these worksheets can be downloaded for free.
Periodic Table | Chart
Help grade 5, grade 6, and grade 7 children crack an intriguing aspect of chemistry! Get the hang of a periodic table that delineates aspects of a chemical element: its mass, electron configuration, chemical properties, and more.
Identifying Periodic Table Families
There are various families of elements like alkali metals, basic metals, transition metals, and more. In this color-coded pdf worksheet, 5th grade and 6th grade students complete the missing parts and identify the nine periodic table families.
An atomic number is the number of protons in a nucleus; a mass number is the number of protons and neutrons. The task in this printable worksheet is to write the missing pieces of information in a table.
Identifying the Elements
Watch 7th grade and 8th grade students display an elite knowledge of elements in this periodic table MCQ pdf, where they read each fact and recognize which of the three given elements best represents it.
Periodic Table | Testing Your Knowledge
On the left side of this middle school pdf exercise is part of the information about an element, and on the right side is a question that tests students' awareness of its name, symbol, atomic number, or atomic mass.
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- • 8.4 Periodic Table
Edwards, Stephen (Grade 8 Physical Science Teacher)
- • 8.1 Scientific Investigation
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- • 8.3 Atomic Theory
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P.S. 4: Periodic Table
- Use the periodic table of elements to obtain information about the atom of an element: symbol, atomic number, atomic mass, state of matter at room temperature, and number of outer energy level (valence electrons).
- Describe the organization of the periodic table in terms of: atomic number, metal, metalloids, non-metals, and groups/families vs periods.
- Categorize given elements as metal, non-metal, or metalloid.
- Given a chemical formula, identify the elements and the number of atoms of each which comprise the compound.
- Recognize that the number of electrons in the outermost energy level determines an element's chemical properties or chemical reactivity. Relate this to the octet and duet rules with regard to valence electrons.
- Predict what type of bond will likely form (ionic or covalent) when metals and non-metals combined chemically.
- Describe the difference between ionic and covalent bonding.
- Recognize that an atom's identity is related to the number of protons in its nucleus.
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The periodic table’s name comes from the fact that it arranges the elements into repeating sets, otherwise known as “periods.” These periods are defined by the covalence of an element, the number of electrons it has in its outermost shell a...
The Periodic Table offers basic information about each one of the known chemical elements. Each element has its own box in the table, and these boxes include the element’s atomic number, atomic weight and chemical symbol.
There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002. Russian scientist Dmitri Mendeleev is usually credited with the first known p...
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Eighth Grade (Grade 8) Periodic Table and Elements questions for your custom printable tests and worksheets. In a hurry? Browse our pre-made printable
Resource type: Worksheet/Activity.
Suitable for: Grade 5, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10.
This promising set of printable worksheets for grade 5 through grade 8 includes a color-coded periodic table chart, completing the periodic table and
Browse periodic table worksheets 8th grade resources on Teachers Pay Teachers, ... 8th - 12th, Higher Education, Adult Education.
Use the periodic table of elements to obtain information about the atom of an element: symbol, atomic number, atomic mass, state of matter at room temperature