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Standard IX
Chemistry
Electron Distribution in Different Orbits
Sulphur has a...
Question

Sulphur has an atomic number 16 and a mass of 32.

State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

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Solution

Atomic number = 16
Atomic mass = 32
Number of protons = 16
Number of electrons = 16
Number of neutrons = 32–16 = 16
Electronic configuration = 2, 8, 6


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Q.

A sulphur atom contains 16 protons and 16 neutrons. Give its atomic number and atomic mass number.

Q. The atomic number of sulphur is 16 and its atomic mass is 32. What is the number of neutrons in sulphur?
Q. Complete the following table.​

(i)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

9​

-​

10​

-​

-​

-​

(ii)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

16​

32​

-​

-​

-​

Sulphur​

(iii)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

16​

32​

-​

-​

-​

Sulphur​

(iv)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

-​

2​

-​

1​

-​

-​

(v)

Atomic number​

Mass number​

Number of neutrons​

Number of protons​

Number of electrons​

Name of the Atomic species​

-​

1​

0​

1​

1​

-​

Q. An atom of an element contains 13 electrons. Its nucleus has 14 neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass 2 units higher. What will be the number of protons, neutrons and electrons in the isotope?
Q.

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(c) An atom has atomic mass number 23 and atomic number 11. The atom has .................... electrons.

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

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Standard IX Chemistry
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