down 1.
A group of chemical symbols that represents the atoms that are a part of a compound. (2 words)
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down 2.
The number of protons in the nucleus of an atom. Elements are arranged according to this in a periodic table. (2 words)
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down 3.
Atoms are made up of tiny particles, such as protons, neutrons, and electrons, which are known as ____ particles.
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down 6.
Elements that are unstable and break down naturally, such as uranium, are known as ____ elements.
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across 1.
One or two letters that represents one element. (2 words)
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across 4.
The process where atoms are joined together. The sun and other stars use this process to create enormous energy.
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across 5.
A ____ change occurs when atoms join to form a compound.
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across 7.
The basic building blocks of matter and the smallest part of an element.
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across 8.
An element cannot be broken down into a ____ substance.
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across 9.
A list of elements. (2 words)
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across 10.
A particle which is made up of two or more atoms of the same or different elements. When water is broken down to this, it consists of two atoms of hydrogen and one atom of oxygen.
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