Question

Atomic radii of the elements of second period are given below
2nd period elements B Be O N Li C
Atomic radii (pm) 88 111 66 74 154 77
(a) Arrange them in decreasing order of their atomic radii.
(b) Which elements have the largest and the smallest atoms?
(c) How does the atomic radii change as you go from left to right in a period?
A substance ‘X’ used as an antacid reacts with Hydrochloric acid to produce a gas ‘Y’ which is used in extinguishing fire.
(a) Name the substance X and gas Y.
(b) Write a balanced equation of the reaction between X and hydro- chloric acid.

Answer 1

a)carbon (C),OXYGEN(O),BERYLLIUM(BE),LITHIUM(LI),NITOGEN(N).
b)Lithium-largest
oxygen-smallest
c)The atomic radius decreases due to increase in the nuclear pull.
a)X-Sodium(Na).
Y-CARBONDIOXODE.

Answer 2

ANSWER
...........

1. CARBON

2. OXYGEN

3. BERRILIUM

4. LITHIUM

5. NITROGEN
........


1.HERE THE LITHIUM IS THE LARGEST

2. OXYGEN IS THE SMALLEST
.....

➡️ ➡️ ➡️ ➡️

THE ATOMIC RADIUS IS DECREASES BECAUSE OF THE INCREASED IN THE NUCLEAR PULL

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