Question

Q1)Name the following with reference to the elementa of the first three periods of the periodic table:

A) The valency of elements in group 14,15.

B) A covalent compound formed between an element in period 2 and a halogen

C) An electrovalent compound formed between an alkaline earth metal and a halogen.

Q2)the relative atomic mass of a light element upto calcium is approximately _________ its atomic no.

PLEASEEE answer quickly because ive got my test tomo :(

Answer 1

1-     valency will be 4 and 3respectively. Because in group 14 valence electron is 4 soit shares the electrins.  In grop 15  it ha valence electon 5 and it needs five more electrons to complete its octet

Answer 2

A ) the valency of element in group 14,15.