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Nature of Matter

An element is...

Question

An element is represented by symbol ${}_{15}^{31}X$ .
What is the mass number and atomic number of element X.

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Solution

Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Mass number(A)- The number of protons and neutrons combine to give us the mass number of an atom.
The atoms are written in this manner ${}_{Z}^{A}X$ where A denotes mass number and Z denotes the atomic number.
Hence, the mass number of the given element is 31 and the atomic number is 15.
Phosphorous(P) is the element having the atomic number 15.

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An element is represented by symbol ${}_{15}^{31}X$ .

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Q. An element along with its atomic number and mass number is represented as

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Elements	Number of protons	Number of electrons	Number of neutrons
A		x	y
B	a		b
C		m	m + 2
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