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Standard XII

Chemistry

Quantum Numbers

Atomic number...

Question

Atomic number of an atom Z = 17 and the mass number A = 35.
a) Find the number of protons, electrons, and neutrons in the atom.
b) Write the electronic configuration of the atom.
c) Draw the Bohr model of atom.

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Solution

a) Since the atomic number of the given element is 17, the number of protons and electrons would be 17. The mass number is 35. Therefore the number of neutrons is (35 - 17) = 18. [1 mark]

b) The number of electrons in the given element is 17. Therefore the electronic configuration is (2, 8, 7). [1 mark]

c) The Bohr model of the atom would be: [1 mark]

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Similar questions

Q. Which of the following statement is always correct?

(a) an atom has equal number of electrons and protons

(b) an atom has equal number of electrons and neutrons

(d) an atom has equal number of electrons, protons and neutrons

The nucleus of an atom has 5 protons and 6 neutrons. What would be the (a) atomic number, (b) mass number, (c) the number of electrons, and (d) the number of valence electrons, per atom of this element?

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. An atom X has a mass number of 35 and contains 17 electrons. Find the number of protons, electrons, and neutrons, along with the atomic number of the ion X

^{-}

Write the number of protons, electrons, and neutrons present in ${}_{17}^{35}{Cl}$ element. Give the electronic configuration and draw the atomic diagram.

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Atomic number of an atom Z = 17 and the mass number A = 35. ​ a) Find the number of protons, electrons, and neutrons in the atom. ​ b) Write the electronic configuration of the atom. ​ c) Draw the Bohr model of atom.​

Atomic number of an atom Z = 17 and the mass number A = 35.
a) Find the number of protons, electrons, and neutrons in the atom.
b) Write the electronic configuration of the atom.
c) Draw the Bohr model of atom.