Periods

Q.

What is the electron configuration of argon?

Q.

Ce-58 is a member of

(A) s-block elements

(B) p-block elements

(C) d-block elements

(D) f-block

Q.

268. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f; The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32, and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series off-block elements, are called. lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.

The element with atomic number 57 belongs to

1. s - block

2. p - block

3. d - block

4. f - block

Q. The atom having the valence shell electronic configuration $4s^{2}4p^2$ would be in?

1. Group 2 or II A and period 3
2. Group 12 or II-B and period 4
3. Group 14 or IV-A and period 4
4. Group 14 or IV-A and period 3

Q.

In the modern periodic table, the period indicates the value of

1. Atomic number

2. Atomic mass

3. Principal quantum number

4. Azimuthal quantum number

Q. The atom having the valence shell electronic configuration $4s^{2}4p^2$ would be in?

1. Group 2 or II A and period 3
2. Group 12 or II-B and period 4
3. Group 14 or IV-A and period 4
4. Group 14 or IV-A and period 3