Question

Atomic size refers to radius of atom. The atomic size may be visualised as the distance between

the centre of the nucleus and the outermost shell of an atom.

(i) How does atomic size vary along period 2 from left to right and why?

(a) Atomic size increases as atomic number increases

(b) Atomic size increases as number of protons increases

(c) Atomic size decreases as electrons added to same shell and with increase in number

of protons, nuclei attracts electrons more

(d) Atomic size decreases as proton has higher positive charge than negative charge on

electron and thus protons pulls electrons towards nucleus.

(ii) How does atomic size vary in group 1 and group 17 and why?

(a) Atomic size increases because electrons added to the penultimate shell

(b) Atomic size increases because electrons added to next higher energy shell

(c) Atomic size decreases because electrons added to penultimate shell

(d) Atomic size decreases because electrons added to same shell

(iii) Which group elements have largest size in periodic table?

(a) Group 1 (b) Group 2 (c) Group 17 (d) Group 18

(iv) Which element of group 17 is most reactive?

(a) F (b) Cl (c) Br (d) I

(v) Which of the following has higher distance between the centre of the nucleus and the

outermost shell of an atom?

(a) Li (b) C (c) Be (d) I​

Answer 1

Answer:

the atomic number and the mass number of these elements.

Explanation:

atomic size in the period-

(a) New shells are being added gui

Answer 2

Here goes your answer dude..

(i) (c) Atomic size decreases as electrons added to same shell and with increase in number.

(ii) (d) Atomic size decreases because electrons added to same shell.

(iii) (a) Group 1

(iv) (a) F

(v) (a) Li

Hope it helped u.. Mark as brainliest..