atoms and the periodic table

water and carbon dioxide are examples of

elements in a group have similar

the proton number tells you how many

the maximum numbers of electrons allowed in the outer energy shells are

what is the centre of an atom called

approx how many elements on the periodic table

the elements in group 7 are called

elements in group 1 are called the

the symbol CO2 is for

two or more atoms joined together is called a

what particle in the atom has no charge

the simplest element on the periodic table is

group 0/8 elements are know as the

elements contain

when elements chemically combine they form

vertical columns in the periodic table are called

how many electrons can fill the first energy shell

the chemical symbol for sodium is

most of the elements are

what charge does a proton have