Question

Answer A is correct . Kindly tell what is 31

Answer 1

Answer:

(a) Given that, number of electrons in element X = 15 and number of neutrons = 16 Atomic number = number of protons = number of electrons in neutral atom = 15 Mass number = number of protons + number of neutrons = 15+16=31

step by step explain:

So Option ( a ) ₁₅X³¹ is the correct answer

Explanation:

We Have :-

An element X with 15 electrons and 16 neutrons

To Find :-

Correct Representation of the element

Solution :-

In an element

Number of electrons = Number of protons

Number of protons = 15

Atomic number = Number of protons

Atomic number = 15

Mass number = Number of protons + Number of neutrons

Mass number = 15 + 16

Mass number = 31

So element is represented by ₁₅X³¹

So Option ( a ) ₁₅X³¹ is the correct answer