Question

an ion Y3- contains 18 electrons and 16 neutrons. calculate the atomic number and mass number of the element Y. name the element Y​

Answer 1

Answer:

Number of electrons in the neutral atom = 18 - 3 = 15. Now, for a neutral atom, Atomic number=Number of protons = Number of electrons. Mass number of the element=Number of protons + Number of neutrons. The given element Y with atomic number 15 is phosphorus.

Answer 2

Answer:

The atomic number is 15 and mass number is 31

Explanation:

The atomic number of an ion Y3- is

18-3=15

To calculate mass number, No.of protons + No.of neutrons. i.e is 15 + 16 = 31

The name of the element is phosphorus