A certain atom has an atomic mass of 19 and atomic number of 9? a. How...

A certain atom has an atomic mass of 19 and atomic number of 9?

a. How many protons does it have?

b. How many neutrons does it have?

c. Using a periodic table, what element is this?

d. If its charge is +2, how many electrons does it have?

Expert Solution

Given: atomic number= Z= 9

Atomic mass number = A = 19

A) number of protons in an atom is equal to its atomic number = Z = 9

B) number of neutrons in an atom is calculated by subtracting atomic mass number with atomic number

n = A - Z = 19 - 9 = 10

C) using periodic table, the element having atomic number 9 is Fluorine. Hence the given atom is of fluorine.

D) in neutral atom, number of protons and number of electrons are equal. If electrons are removed from the atom, the atom acquires positive charge. And if electrons are added in neutral atom, then it acquires negative charge..

Here the charge of the atom is 2+ means 2 electrons have been removed so number of electrons in it would be 9-2 = 7

gladiator answered 2 years ago

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