Chemistry

The Nucleus - PROTONS and NEUTRONS

Around the Nucleus - ELECTRONS in SHELLS

2  ,  8   ,  8   (ATOMIC NO.) groups have same outer no.

ELECTRONS - NEGATIVE

PROTONS - POSITIVE

Mass Number (TOP) protons and neutrons

Atomic Number (BOTTOM) protons

Columns - GROUPS -   SIMILAR CHEMICAL PROPERTIES

Rows - PERIODS

REACTIVE METALS - TRANSITION METALS - OTHER - NON - NOBLE GASES

IONIC BONDING 

Group 1 - 1 outer electron           Group 7 - 7 outer electrons

GAIN ELECTRONS  (Cl-)          LOSES ELECTRON (Na+)

Atoms that have lost/gained are IONS.

-ve ions = anions             +ve ions = cations