class 8th F Chapter 4

______________________ grop elements are known as inert gases.

• alkali metals

• alkaline earth metals

• halogens

• noble gases

G.N Lewis explain why atoms undergo chemical reaction he called his explaination as:

• electronic configuration

• octet rule

• duplet rule

• auf bau principle

lithium and beryllium tends to achieve ________________ electron configuration in outer most shell.

• 2

• 8

• 4

• 3

how atoms gain stability

• losing electrons

• gaining elecrons

• sharing electron

• all above

metals usually form ________ ion

• cation

• anion

• neutral

• none

which groups in the periodic table are metals except hydrogen

• IA,IIA,IIIA

• IA,IIA

• IA,IIA,VIIA

• IA,IIA,IIIA,VIA

which elements usually form cation

• metals

• non metals

• halogens

• noble gases

anion are _________ charged.

• positively

• negatively

• no charge

• both + / -

non metals usually form _______________________ ions

• can't make ion

• positive

• negative

• both + / -

which bond is formed between metal and non metal atoms

• covalent

• ionic

• metallic

• none of these