Question

Choose the correct option: a. The element that belongs to 2nd period and 18th group is i. Helium ii. Neon iii. Argon iv. Flourine b. One of the following is charged and cannot exists independently i. Polyatomic molecule ii. Molecule iii. Atom iv. Polyatomic ion c. Calcium carbonate contains which polyatomic ion i. Nitrate ii. Carbonate iii. Carbon Dioxide iv. Calcium d. Ammonium Chloride has polyatomic ion ammonium. State its charge. i. +1 ii. +2 iii. 0 iv. -1

Answer 1

Answer:a) Helium

B)atom

C)calcium

D) +1

Explanation:

Answer 2

Answer:

a)ii,b)iv,c)ii,d)i

Explanation:

a)ii.Neon

b)iv.poly atomic ion

c)ii.Carbonate

d)i.+1