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Standard IX

Chemistry

Electron Distribution in Different Orbits

In an electri...

Question

In an electrically neutral atom X, the number of
nucleons is twice the number of electrons. If the valence shell, M, of the atom contains two electrons, then:

a) Identify the element and write its atomic symbol.
b) Draw Bohr’s atomic model of the atom.

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Solution

a) The element X is magnesium (Mg). The atomic symbol of magnesium is $2412 M g$

b)

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Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

Q. (a) What are valence electrons? Where are valence electrons situated in an atom?
(b) What is the number of valence electrons in the atoms of an element having atomic number 13? Name the valence shell of this atom.

(a) Describe Bohr's model of the atom. How did Neils Bohr explain the stability of atom?

(b) An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.

Q. Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?

Q. Identify the valence shell and the corresponding number of electrons for a neutral atom with atomic number, Z = 24.

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In an electrically neutral atom X, the number of ​ nucleons is twice the number of electrons. If the valence shell, M, of the atom contains two electrons, then:​ a) Identify the element and write its atomic symbol. b) Draw Bohr’s atomic model of the atom.

a) The element X is magnesium (Mg). The atomic symbol of magnesium is 2412Mg b)

In an electrically neutral atom X, the number of
nucleons is twice the number of electrons. If the valence shell, M, of the atom contains two electrons, then:

a) Identify the element and write its atomic symbol.
b) Draw Bohr’s atomic model of the atom.

a) The element X is magnesium (Mg). The atomic symbol of magnesium is $2412 M g$

b)