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Byju's Answer
Standard IX
Chemistry
Rutherford's Experiment and Observations
Why is atomic...
Question

Why is atomic mass = protons + neutrons ? Neutrons = protons + neutrons ryt ?

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Solution

Atom mass is due to the mass of the nucleus. Nucleus is made up of protons and neutrons. That is why the atomic mass = protons + neutrons. Thus nucleons = protons + neutrons

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Q. Identify the correct statements.
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
Q.

Mass defect (Δm) is given by?


Q. Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
Q. The three smaller particles present in an atom are
(a) elections, protons, neutrons
(b) electrons, portions, neutrons
(c) electrons, protons, neotrons
(d) electrons, protons, neutrons
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​

-​

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