MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Variation of Valency

Four elements...

Question

Four elements A,B,C and D have atomic number 9,11,12 and 20 respectively.
a) Which pair of elements belongs to same group?
b) Which pair of elements belong to same period?
c) Which element is having 20 neutrons?
d) Identify A,B and C

Open in App

Solution

A - 2,7
B- 2,8,1
C- 2,8,2
D- 2,8,8,2

a. C and D (same number of electron in last shell)
b. B and C (sme number of shells)
c. D
d. A - F(fluorine), B- Na(sodium), C-Mg (magnesium), D -Ca (calcium)

Suggest Corrections

thumbs-up

0

Similar questions

Q. The elements

A, B, C, D a n d E

have atomic number 9, 11,17,12 and 13, respectively. Which pair of elements belongs to the same group?

Q. The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:

(a) A and B
(b) B and D
(c) A and C
(d) D and E

Q. The atomic numbers of three elements A, B and C are given below:

Element	Atomic number
A	5
B	7
C	10

(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

Q. From the elements of the following atomic numbers

9, 12, 16, 20, 38, 47

56

, identify the elements that belong to same group in periodic table:

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Contraceptive Methods

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Variation of Valency

Standard X Chemistry

Join BYJU'S Learning Program

CrossIcon