Question

Crossword Puzzle:
Clues:
Down:
1. Helium Nuclei (Particle)
2. Positive Charge mass at the core of the atom
3. An atom whose valency is zero
4. One or two electrons in the outermost shell of atoms of elements are called as ______________ electrons.
5. 14 C 6 is used for carbon dating
6. Discovery of neutron
Across:
1. Electrons present in the outermost shell
2. Th is pair of atoms 40 Ca 20, 40 Ar 18 are ____
3. An atom that does not have neutron
4. Scattering of α particles in the gold foil experiment

Answer 1

2=proton

3=neon

4=monovalent

across

3=hydrogen

4=alpha particles

Answer 2

The answers for the given crossword puzzle are as follows:

Down:

1. Helium Nuclei (Particle)- alpha particles.

2. Positive Charge mass at the core of the atom- proton.

3. An atom whose valency is zero- argon.

4. One or two electrons in the outermost shell of atoms of elements are called as valence electrons.

5. 14 C 6 is used for carbon dating- marker( radioactive marker).

6. Discovery of neutron- Chadwick.

Across:

1. Electrons present in the outermost shell- valence electrons.

2. The pair of atoms 40 Ca 20, 40 Ar 18 are isobars.

3. An atom that does not have neutron- hydrogen (protium).

4. Scattering of α particles in the gold foil experiment- Rutherford scattering.