Question

answer properly plzzz with reason.?

Answer 1

answer 1  The process of addition of electrons is called reduction and element that gives electrons(s) is called reducing agent.
Alkali metals have one electron in their valence shell. These metals participate in chemical reaction with the loss of electron to get nearest noble gas configuration. 
During reactions alkali metals redely gives their valence electron, thus these metals are considered as strong reducing agents.
Ex: 2Na + Cl2 → 2NaCl

Na + H2 → 2NaH

and

p-block elements are highly electronegative with low dissociation energies and high negative electron gain enthalpies. Therefore, they have a high tendency to gain an electron. Hence, they act as strong oxidizing agents. \

answer 2 

 lanthanum and actinium are in block d. 

Lanthanum electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2 

La is 

(Xe) 6s2 5d1 


This is one of those exceptions that dont conform to the expected order of filling orbitals. 

Ok we'd expect (Xe) 6s2 4f1. But whats found is there is no 4f electron, but it does have 1 5d electron. So this shows how 4f and 5d subshells have similar energies, and electrons change from one subshell to another pretty easily. 

and same for actinium.

answer 3

option (d) Tungsten objects are also commonly formed by sintering. Of all metals in pure form, tungsten has the highest melting point (3422 °C, 6192 °F).

answer 4

A Group 11 element is one in the series of elements in group 11 (IUPAC style) in the periodic table, consisting of transition metals which are the traditional coinage metals of copper (Cu), silver (Ag), and gold (Au).

answer 5 

3rd group or lll(A) has highest number of elements and total no. of elements is 32  

regards