Question

An atom of element E contains 3 protons, 3 electrons, and 1 neutron

[A] what is the atomic number?

[b] what is the mass number? [c] write the electronic configuration of the element E

[d] state whether element E is a metal or a non-metal? why?

[e] what type of ion, cation or anion, will be formed by an atom of the element E? why?

[f] write the symbol of the ion formed by an atom of element E

[g] what could element X be

Answer 1

Answer:

A) 3

B) 4

C) 2, 1

D) Metal, because it lies in Group 1A

E) It will form a cation as it'll lose 1 electron

F) Li (Lithium)

Explanation:

A) As atomic number = Number of protons,

Then, atomic number = 3

B) As mass number = Number of protons + Number of neutrons

Then, mass number = 3 + 1 = 4

C) The first orbital can have only 2 electrons,

So, electron config. = 2, 1

D) The element is metal as it lies in the Group 1A which consists of alkali metals.

E) The element will form a cation because it's going to give electrons.

F) The element is Lithium. And its symbol is Li