Chemistry

what is an atom

• smallest part of the universe

• smallest part of a substance

• smallest part of anything

• smallest part of water

protons

• negative charge, nucleus

• positive charge, shells

• positive charge , nucleus

• neutral charge, nucleus

electrons

• no charge, nucleus

• positive charge, nucleus

• negative charge, shells

• negative charge, nucleus

mass number

• number of protons

• number of electrons

• number of protons and electrons

• number of protons and neutrons

atomic symbol

• capital letter

• lowercase letter

• 2 capital letters

• 2 lowercase leters

lst shell holds

• 2

• 8

• 18

• 32

2nd shell holds

• 2

• 8

• 18

• 32

3rd shell holds

• 2

• 8

• 18

• 32

4th shell holds

• 2

• 8

• 18

• 32

same number of protons, different number of neutrons

• atomic number

• mass number

• isotope

• ion