Question

Question 3
Name

(a) three elements that have a single electron in their outermost shells.


(b) two elements that have two electrons in their outermost shells.


(c) three elements with filled outermost shells

Answer 1

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• (a) Lithium (Li), sodium (Na), and potassium (K) have a single electron in their outermost shells.

• (b) Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.

• (c) Neon (Ne), argon (Ar), and xenon (Xe) have filled outermost shells.

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Answer 2

Answer:

(c) 3 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 donnot gain, lose or share electron

(b) Barium and Radium are the two elements which have two elements in their outer most shell.

(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.