Chemistry, asked by jitendraNagar794, 1 year ago

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

NCERT Class IX
Sciences - Exemplar Problems

Chapter 4. Structure of the Atom

Answers

Answered by anusharma20105

1

2 u as proton and neutron has same no.

Answered by kvnmurty

5

atomic mass number = number of neutrons + number of protons
number of neutrons = 4 - 2 = 2

Previous Question

Next Question

Similar questions

Chemistry, 7 months ago

Calculate the mass of the following: (i) 2 moles of carbon dioxide. (ii) 6.022 x molecules of carbon dioxide. I will mark you the brainliest for sure if you answer this as quickly.

English, 7 months ago

God helps us to choose that road that we take...

Math, 7 months ago

The difference of a given number and 1 is the dash of the number b.

Chemistry, 1 year ago

Fill in the blanks: (a) Evaporation of a liquid at room temperature leads to a——— effect. (b) At room temperature the forces of attraction between the particles of solid substances are———than those which exist in the gaseous state. (c) The arrangement of particles is less ordered in the ——— state. However, there is no order in the ——— state. (d) ——— is the change of gaseous state directly...

Chemistry, 1 year ago

For the following statements, write T for True and F for False. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (c) The mass of an electron is about 1/2000 times that of proton. (d) An isotope of iodine is used for making tincture iodine, which is used as a...

Social Sciences, 1 year ago

Show me some illustrations showing different sources of livelihood??

English, 1 year ago

want a letter describing about a day's fun in a theme park...

Biology, 1 year ago

(i) Why are canines absent or reduced in herbivorous mammals? (ii) Which food stuff yields the maximum amount of energy on complete combustion and how much? (iii) Cellulose is not digested in humans whereas cows can digest it. Give reason. (iv) Fill in the Blank; Dietary fibres are composed of - (v) Why are vitamins important for animals even when they do not produce energy?