What is the correct labeling for the atom?
a) a—neutrons, b—electron, c—proton, d—nucleus
b) a—nucleus, b—electron, c—proton, d—neutron
c) a—proton, b—neutron, c—electron, d—nucleus
d) a—proton, b—electron, c—neutron, d—nucleus

Option (A) is the correct answer.

Explanation:

Each atom consists of three sub-atomic particles which are protons, neutrons and electrons.

And, inside the nucleus of an atom, there will be only protons and neutrons. Whereas electrons revolve around the nucleus of an atom.

Protons have a positive charge, neutrons have no charge and electrons have a negative charge.

Therefore, we can conclude that the correct labeling for the atom A—neutrons, B—electron, C—proton, D—nucleus.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.