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Question
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
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Solution
The total number of protons and neutrons in the nucleus of an atom is called its mass number.
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Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
The properties of the elements are a periodic function of their __________.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Argon – \[\ce{^40_18Ar}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Calcium – \[\ce{^40_20Ca}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
Define the term of atomic number.
What is atomic number?
Explain the following terms.
- Proton
- Electron
- Neutron.
The Atomic number of an element is 20. It has ______ valence electrons.
An element has 2 electrons in its N shell.
What is its atomic number?
