Question

A tetra positive ion has 42 electrons and 50 neutrons. What is the atomic mass of the element? *​

Answer 1

Explanation:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

Answer 2

Answer:

$\sf{ \green{ \underline{Atomic \: mass} = no. \: of \: neutrons } }\\ \green{\sf{+ \: Atomic \: number }}$

The ion is tetra positive, I.e., it has a 4+ charge.

A 4+ charge on an ion means 4 protons are in excess.

If the number of electrons = 42

The number of protons will be = 42 + 4

= 46

(Reason: In a neutral atom, the number of electrons = the number of protons. Since this ion has a charge of +4, there will be 4 protons more than the number of electrons given.)

The atomic number of an element is the number of protons present in its nucleus.

• Atomic number = 46
• Atomic number = 46 Number of neutrons = 50

Atomic mass = number of neutrons + Atomic number

____________________

Atomic mass = 46 + 50

= 96