Chemistry, asked by anitajaiswal5569, 9 months ago

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?
A) 21 B) 17 C) 19 D) 9

Answers

Answered by Bhavya5161

0

Answer:

I think it option B

I hope it will be helpful

Answered by manu9035

8

Answer:

A .21

please do follow me

Previous Question

Next Question

Similar questions

Hindi, 4 months ago

bibliography for hindi project...

Science, 4 months ago

Multiple choice Questions Q.1. In which state of matter, process of diffusion is fastest: (a) Liquids () Gases (c) Solids (d) Semi-solids 0.2. Evaporation is called as: (a) Surface phenomenon (b) Bulk phenomenon CBSE self-Study in Science-9...

Biology, 4 months ago

if p is linear momentum and e is kinetic energy then P²/E has dimensions of...

Science, 9 months ago

What causes the mottling of the dental enamel ? A) High levels of chlorine in water B) High levels of nitrate in the water C) High levels of fluorides in the water D) High levels of calcium in the water...

English, 9 months ago

A group of interconnected islands is known as __________ . A) Strait B) Peninsula C) Archipelago D) Lagoon...

Computer Science, 1 year ago

. Write T (True) or F (False) against each statement : 3. Width of a column can be changed as per your requirement. 4. You can not add shade to the table.

Math, 1 year ago

the length of a banner is 7 feet 8 inch and the width is 5 feet 11 inch what is area of the banner...

Science, 1 year ago

What is the 4 types of tectonic plate movement?No spamming.will mark as brainiest:)...