Question

An atom of phosphorus has the symbol
$3115P$. Give the number of protons, neutrons and electrons in an atom of phosphorus.

Number of protons __(A)___.
Number of neutrons __(B)___ .
Number of electrons __(C)___ .

• A. (A) - 15, (B) - 16, (C) - 15
• B. (A) - 15, (B) - 15, (C) - 15
• C. (A) - 15, (B) - 15, (C) - 16
• D. (A) - 16, (B) - 16, (C) - 15

Answer 1

The correct option is A (A) - 15, (B) - 16, (C) - 15

The number of protons present in the nucleus of an atom is known as the atomic number. It also represents the number of electrons in the orbit. It is denoted by Z.

The total number of protons and neutrons present in the nucleus of an atom is known as the mass number. It is denoted by A. Generally atomic number and mass number of an element are represented by a symbol $AZX$ , X is the element.