Advertisements
Advertisements
Question
Define the term ‘mass number’ of an atom.
Advertisements
Solution
Mass number of an element is equal to the sum of protons and neutrons in the nucleus of the atom.
APPEARS IN
RELATED QUESTIONS
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
Multiple Choice Questions
The sub atomic particle with negative charge is
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
Explain the following terms.
- Proton
- Electron
- Neutron.
______ = No. of protons = No. of the electrons.
What is the relation between mass number & atomic number?
Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.
