Question

Write the symbol for every chemical element that has atomic number less than 5 and atomic mass greater than 8.3 u.

Answer 1

Atomic m. Element Atomic no. Symbol

1.0079u Hydrogen 1 H

4.0026u Helium 2 He

6.941u Lithium 3 Li

Additional information:-

★ Atomic number : The number of protons in one atom of an element is known as atomic number.

• Atomic number of an element = No. of protons in one atom of element.

• The atomic no. of element is denoted by the letter z .