Question

q- T, Q and R are located in the same group in the periodic table of elements ​

Answer 1

1) group 1

2) as 1 electron is present in it's outer most shell.so it's valency is 1

3) T is Lithium (2,1)

Q is sodium(2,8,1)

R is potassium (2,8,8,1)

4) as we know that potassium is larger in size than sodium so it's valence electrons are away from the nucleus thus reducing the nuclear attraction between them hence the valence electrons of potassium can be removed easily as compared to sodium.hence potassium is more reactive than sodium

I hope this helps (θ‿θ)