An atom of an element X may be written as X 4 9 What does the figure 9 indicate?

It represents mass number. The mass number of an atom goes above the symbol and an atomic number is written as a subscript. The mass number of an element is also called atomic mass number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic mass of an element.

An atom of an element X may be written as X 4 9 . What does the figure 4 indicate ?

It represents an atomic number. The mass number of the atom goes above the symbol and the atomic number is written as a subscript. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.

An atom of an element X may be written as X 4 9 . What are the number of protons in an atom X ?

A number of protons in atom X = Atomic number = 4 . The symbol for the atomic number is Z. The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.

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Chemistry for Class IX>Chapter 4 - Structure of the Atom>Exercise

Dr. Pankaj Rai Solutions for Chapter: Structure of the Atom, Exercise 1: Exercise

Author:Dr. Pankaj Rai

Dr. Pankaj Rai Chemistry Solutions for Exercise - Dr. Pankaj Rai Solutions for Chapter: Structure of the Atom, Exercise 1: Exercise

Attempt the free practice questions on Chapter 4: Structure of the Atom, Exercise 1: Exercise with hints and solutions to strengthen your understanding. Chemistry for Class IX solutions are prepared by Experienced Embibe Experts.