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Question
Name or state the following:
Elements having same mass number but different atomic number
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Solution
4018Ar and 4020Ca
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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 atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
- Has four electrons in its valence shell?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
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]
Differentiate between the following term:
Atomic number and mass number
Differentiate mass number from atomic number.
‘Z’ is denoted by ______.
