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Question
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
Options
mass number
atomic number
number of electrons
all of the above
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Solution
mass number
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RELATED QUESTIONS
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
Fill in the blank of the following statement :
The total number of protons and neutrons 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?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
State the main postulates of Dalton’s atomic theory.
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
What is mass number of an atom?
