Periods

Q. An element X belongs to group fourteen and second period of the periodic table. Its atomic number is:

1. seven
2. eleven
3. fifteen
4. six

Q.

All elements in 3rd period have

1. An atomic number 3

2. 3 complete sub-shells

3. Valence electrons shell

4. 3 electrons less than the octet

Q. Which is true about effective nuclear charge?

1. Z_eff decreases from top to bottom

2. =Screening Constant

3. Z_eff increases from top to bottom

4. Z_eff increases as we move from left to right in the Periodic table

Q. Atomic number of Ag is 47. In the same group the atomic number of elements placed above and below Ag will be

1. 37, 67

2. 29, 79

3. 39, 69

4. 18, 28

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 number of electron shell as 4 and valence electrons as 2 belongs to

1. group 12 or II B and period 4

2. group 14 or IV A and period 4

3. group 2 or II A and period 3

4. group 14 or IV A and period 3

Q. Element with the electronic configuration as $[Ar{]}^{18}3d^{5}4s^1$ is placed in?

1. IA, s-block

2. VIA, s-block

3. VIB, s-block

4. VIB, d-block

Q. An element has an atomic number of 107. What is its electronic configuration and what will be its group number?

1. [Rn] 5f¹⁴ 6d¹ 7s² 7p⁴ , group 3

2. [Rn] 5f¹⁴ 7s² 7p⁵ , group 7

3. [Rn] 5f¹⁴ 6d² 7s² 7p³ , group 15

4. [Rn] 5f¹⁴ 6d⁵ 7s² , group 7

Q.

An element has an electronic configuration 2, 8, 7. It belongs to the _________________.

1. 17th group & 2nd period

2. 7th group & 3rd period

3. 3rd group & 7th period

4. 17th group & 3rd period

Q. In the modern periodic table, the periods are represented by:

1. columns
2. diagonal rows
3. individual elements
4. horizontal rows