1.
the basic unit of a chemical element.
2.
the mass of an atom of a chemical element expressed in atomic mass units
3.
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
4.
The number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole, approximately 6.022 x 10^23.
5.
substance formed by the chemical combination of two or more elements in definite proportions
6.
A chemical bond that involves the sharing of electron pairs between atoms.
7.
Elements found in nature as pairs (consisting of two atoms)
8.
A subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
9.
A pure substance made of only one kind of atom
10.
a vertical column of elements in the periodic table
11.
A type of chemical bond that involves the electrostatic attraction between oppositely charged ions.
12.
Variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
13.
The total number of protons and neutrons in a nucleus.
14.
The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12.
15.
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
16.
A subatomic particle of about the same mass s a proton but without an electric charge, present in all atomic nuclei except those of a ordinary hydrogen.
17.
A horizontal row of elements in the periodic table
18.
A table of the chemical elements arranged in order of atomic number.
19.
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
20.
A notation of one or two letters representing a chemical element
21.
The electrons in the outer shell of an atom that are available to form bonds with other atoms.
