Question

Give the proper definition of : -

• Valency

• Elements

• Atomic Number

• Mass Number

• Isotopes

• Isobars ​

Answer 1

Required Answer :-

1. Valency : Valency is defined as the combining capacity of an element. Valency of an element is equal to the number of valence electrons (electrons present in outermost shell).

2. Elements : Element is a pure susbtance which cannot be broken down further by any chemical processes.

3. Atomic number : Atomic number is equal to the number of protons in the nucleus of atom.Atomic number is also equal to the number of electrons of atom only when it is neutral.

4. Mass number : Mass number is equal to the sum of protons and neutrons of nucleus of atom.

5. Isotopes : Atoms of any element whose nuclei have same number of protons but different number of neutrons.

6. Isobars : Atoms of different elements whose nuclei have same number of nucleons (mass number) but different number of protons and neutrons.

Answer 2

Answer:

Required Answer :-

1. Valency : Valency is defined as the combining capacity of an element. Valency of an element is equal to the number of valence electrons (electrons present in outermost shell).

2. Elements : Element is a pure susbtance which cannot be broken down further by any chemical processes.

3. Atomic number : Atomic number is equal to the number of protons in the nucleus of atom.Atomic number is also equal to the number of electrons of atom only when it is neutral.

4. Mass number : Mass number is equal to the sum of protons and neutrons of nucleus of atom. \begin{gathered}\\\end{gathered}

5. Isotopes : Atoms of any element whose nuclei have same number of protons but different number of neutrons.

6. Isobars : Atoms of different elements whose nuclei have same number of nucleons (mass number) but different number of protons and neutrons.