Question

Q.3 A] The electronic configuration of four elements A,B,C,D are as follows.
A 2, 8, 5
B2, 8, 1
2, 3
D 2,8,6 1) Which of these elements are metals. 2) Which of these elements are non-metals. 3) Which elements will form anion.Which elements will form cation.​

Answer 1

In the periodic table,

#left to right metallic character decreases.

#Elements those are non metals and that have valence electron nearer to octet number will try to accept electron and form anion.

#Elements those are metals and that have less valence electrons will try to loss electron to form octet configuration.So they become cation.

1-non metal..forms anion as it belongs to p block.

2-metal....form cation as it belongs to s block

3-metal...form cation and it belongs to p block 13th group

4-non metal...forms anion and it belongs to p block 16th group

Answer 2

Chemical nature of water

The chemical formula of a molecule of water is H2O: two atoms hydrogen (H2) linked to one atom oxygen (O). The atom electrons (particles with a negative charge) establish links between themselves. Oxygen is more able to keep them close to it than hydrogen