1.
An element with 8 protons.
2.
An element with 2 neutrons and 2 electrons.
3.
An element with the atomic mass number of 1.
4.
A compound of sodium and chloride, commonly known as salt.
5.
A subatomic part of the atom, found in the nucleus with a positive charge.
6.
A subaotmic part of the atom, found in the nucleus with a neutral charge.
7.
A subatomic part of the atom, found in the nucleus with a negative charge.
8.
Central part of the atom where most of the mass is found.
9.
Contains only one type of an atom.
10.
Contains 2 or more different atoms of elements chemically bonded together.
11.
2 or more atoms chemically bonded together.
12.
The number of protons.
13.
The number of protons and neutrons.
14.
Where electrons are found in the nucleus.
15.
An element in group 1 and period 4.
