Which of the following contains same number of elements?A) 1st period

1.	Which of the following contains same number of elements?A) 1st period & zero groupB) 6th period & Ill B groupC) 5th period & III B groupD) 3rd period & VII A group(NO COPIED ANSWERS AND IRRELEVANT ANSWERS)
Answer» Answer:OPTION d is right REASON: 3rd period and VII A group contains same number of elements . They have 8 elements each EXPLANATION: OPTION A: 1ST PERIOD: It consists of hydrogen and helium.there are only TWO elements present in it. ZERO GROUP: it is ALSO known as noble group elements or rare group or INERT group elements. The elements are helium,neon,ARGON,Krypton,xenon,radon and new element oganesson.there are SEVEN elements. SO OPTION A IS INCORRECT OPTION B: 6TH PERIOD: it has 32 elements in total.it also includes inner transition elements. III B GROUP: 13th group is called III B group.it has boron , aluminium,gallium ,indium,thallium , a new element nihonium and two inner transition elements.so TOTALLY it has EIGHT elements. SO OTION B IS INCORRECT OPTION C: 5TH PERIOD: It has 18 elements. It does not include inner transition elements. III B GROUP: it has EIGHT elements. SO OPTION C IS INCORRECT. OPTION D: 3RD PERIOD: It has EIGHT elements. They are sodium, magnesium, aluminium,silicon, phosporous,sulphur,chlorine,argon. VII A GROUP: It is called 17th group.these are halogens.the elements are fluorine, chlorine,bromine,iodine, astatine ,new element Tennessine and two more inner transition elements.so totally EIGHT elements are present. SO OPTION D IS RIGHT REFERENCE: check PERIODIC TABLE for clarification. Explanation:

Which of the following contains same number of elements?A) 1st period & zero groupB) 6th period & Ill B groupC) 5th period & III B groupD) 3rd period & VII A group(NO COPIED ANSWERS AND IRRELEVANT ANSWERS)

Answer»

Answer:OPTION d is right

REASON: 3rd period and VII A group contains same number of elements .

They have 8 elements each

EXPLANATION:

OPTION A:

1ST PERIOD:

It consists of hydrogen and helium.there are only TWO elements present in it.

ZERO GROUP:

it is ALSO known as noble group elements or rare group or INERT group elements.

The elements are helium,neon,ARGON,Krypton,xenon,radon and new element oganesson.there are SEVEN elements.

SO OPTION A IS INCORRECT

OPTION B:

6TH PERIOD:

it has 32 elements in total.it also includes inner transition elements.

III B GROUP:

13th group is called III B group.it has boron , aluminium,gallium ,indium,thallium , a new element nihonium and two inner transition elements.so TOTALLY it has EIGHT elements.

SO OTION B IS INCORRECT

OPTION C:

5TH PERIOD:

It has 18 elements.

It does not include inner transition elements.

III B GROUP:

it has EIGHT elements.

SO OPTION C IS INCORRECT.

OPTION D:

3RD PERIOD:

It has EIGHT elements.

They are sodium, magnesium, aluminium,silicon, phosporous,sulphur,chlorine,argon.

VII A GROUP:

It is called 17th group.these are halogens.the elements are fluorine, chlorine,bromine,iodine, astatine ,new element Tennessine and two more inner transition elements.so totally EIGHT elements are present.

SO OPTION D IS RIGHT

REFERENCE:

check PERIODIC TABLE for clarification.

Explanation: