A monoatomic anion of unit charge contain 46 neutrons and 36 electrons. What is the atomic mass number of element and in which group of periodic table does it lie? Write your answer as 1002 if answer is 10, 2

The atomic mass number of an element IS 80, and it lies in group 17 of the periodic table.

$Z=35,A=45+35=80$ Group = 17

The monoatomic anion has 45 neutrons.

The monoatomic anion has 36 electrons total.

$\therefore$ The number of electrons in a monoatomic atom $=36-1=35$

(Z=35) The atom's atomic number. The atom is thus bromine and is a member of the halogen family in group 17.

No. of protons = No. of electrons = 35

$\therefore$ Atomic mass = No. of neutrons + No. of electrons $=45+35=80$

The answer in the given format is 8017.