The tenth element in the periodic table resides in:

1. the second period

2. the fourth period

3. the fifth period

4. the eight period

Which of the following order is not in accordance with the property stated against it?                                                                                                      

1. F₂ > Cl₂ > Br₂ > l₂ Oxidising Power

2. Hl > HBr >HCl >HF Acidic property in water

3. F₂ > Cl₂ > Br₂ > l₂ Electronegativity

4. F₂ > Cl₂ > Br₂ > l₂ Bond dissociation energy

The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

1. X = 2, 8, 3

2. Y = 2, 8, 8

3. Z = 2, 8, 8, 1

4. j = 2, 8, 8, 7

The most non-metallic element among the following is:

1. Be

2. B

3. Mg

4. Al

Element ₅₈Ce belongs to:

1. s-block elements

2. p-block elements

3. d-block elements

4. f-block elements

How does the shielding effect of d-electrons compare to that of other electrons?

1. Weaker than s-electrons.
2. Stronger than s-electrons.  
3. Same as s-electrons.
4. Same as p-electrons.

Correct statement regarding transuranic elements is :

1. They have higher atomic number than uranium.

2. They are lighter than uranium.

3. They have lower atomic number than uranium.

4. They have same atomic number as uranium.

General electronic configuration of outermost and penultimate shell of an atom is
(n - 1)s² (n - 1) p⁶ (n - 1)d^x ns². If n = 4 and x = 5, the number of proton in the nucleus is:

1. > 25

2. < 24

3. 25

4. 30

The maximum number of valence electrons possible for atoms in the second period of the periodic table is:

1. 18

2. 10

3. 8

4. 2

The element having atomic number 19, is:

1. an inert gas

2. a metal with oxidation number +1

3. a non-metal with oxidation number -3

4. a metal with oxidation number -3