Fill in the following blanks in respect of an atom of an element : Number of protons Number of neutrons Mass number Atomic number Number of electrons Valency 11 12 _____ _____ _____ _____

The atomic number of the given element is 11 . The mass number is the sum of protons and neutrons in the nucleus. The number of protons is equal to the number of electrons. Valency can be determined by knowing the electronic configuration as 2,8,1 . Therefore, the blanks can be completed as, Number of protons Number of neutrons Mass number Atomic number Number of electron Valency 11 12 23 11 11 1

E M B I B E

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 10

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9th CBSE

IMPORTANT

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What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons?

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Important Questions on Structure of Atom

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9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 11

What is the relationship between an atom containing

11

protons,

11

electrons and

11

neutrons, and another atom containing

11

protons,

11

electrons and

12

neutrons?

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 12

What name is given to the pair of atoms such as

N_{7}^{14}

and

N_{7}^{15}

? (Isotopes/Isobars)

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IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 13

What name is given to those isotopes which have unstable nuclei and emit various types of radiations? (Radioactive isotopes/ Non-radioactive isotopes)

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9th CBSE

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 14

Fill in the following blanks in respect of an atom of an element :