Question

(a) Name three elements that have a single electron in their outermost shells.
(b) Name two elements that have two electrons in their outermost shells.
(c) Name three elements with completely filled outermost shells.

Answer 1

Answer:

a- hydrogen

b-helium

c-neon,xenon,argon

Explanation:

Answer 2

a) Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium and Francium elements have one electron in their outermost shell

b) Lithium and Beryllium are two element has 2 electrons in their outer most shells

c) Helium,Neon and Argon have completely filled outermost shell

Explanation:

(a)

• All the elements belonging to 1st group of the periodic table have one electron in their outermost shell.
• So hydrogen, lithium, sodium, potassium, Rubidium, cesium and francium elements have one electron in their outermost shell.

(b)

• Lithium and Beryllium are two element has 2 electrons in their outer most shells and it is applicable for the student to get and right ideas of it and move forward with no trouble of it.

(c)

• Three elements that have completely filled outermost shell are: Helium, Neon and Argon.
• Their common name is "Noble Gas". The gases are unreactive since they have completely filled valence shell and do not gain, lose or share electrons. Hence, they are known as Noble Gases.
• They are also known as "Inert Gases". "Inert" means "Inactive".
• They are also known as "Rare Gases" since they are uncommon on the Earth.