Chemical Periodicity Quiz

1

Who proposed the law of triads?

Newland Dobereiner Mendeleev Moseley

2

Newland’s law of octaves was applicable up to which element?

Calcium Potassium Chromium Cobalt

3

Modern periodic law is based on:

Atomic weight Atomic number Number of neutrons Electronic configuration

4

In Mendeleev’s table, the zero group was added for:

Transition elements Inert gases Lanthanides Actinides

5

The anomaly of inverted pair (Te-I) was removed in modern periodic table because:

Atomic weight of Te > I Atomic number of Te < I Both have same atomic number None

6

Isotopes are placed at the same position because they have:

Same atomic weight Same atomic number Same number of neutrons Different electronic configuration

7

Which series contains 14 elements?

Lanthanide Actinide Both None

8

General electronic configuration of inner transition elements is:

(n-1)d¹⁻¹⁰ ns² (n-2)f¹⁻¹⁴ (n-1)d⁰⁻¹ ns² ns² np⁶ ns¹⁻²

9

Which element does NOT belong to transition series?

Zn Fe Cu Cr

10

In which block are lanthanides placed?

s-block p-block d-block f-block

11

The actinide series starts from atomic number:

57 89 90 104

12

Helium belongs to:

s-block p-block d-block f-block

13

Representative elements have incomplete:

Penultimate shell Outermost shell Both None

14

Hydrogen resembles alkali metals because:

It forms H⁺ It forms H⁻ Both None

15

Telluric screw was proposed by:

Dobereiner Chancourtois Mendeleev Moseley

16

Group VIII in Mendeleev’s table contains how many elements?

3 6 9 12

17

Rare earth elements have same number of:

Valence electrons Total electrons Neutrons Protons

18

Which element has configuration 1s² (exception in inert gas)?

Ne Ar He Kr

19

Lanthanides fill which orbital?

4f 5f 3d 4d

20

Transuranic elements are:

Natural Synthetic Both None