What happens during beta decay? A photon is ejected from a nucleus.
A helium-4 nucleus is ejected from a nucleus.
A neutron changes into a proton, or a proton changes into a neutron.
A proton changes into an electron, or an electron changes into a proton.

A neutron changes into a proton or a proton changes into a neutron

Explanation:

Here, we want to know what happens during a beta decay

In a beta decay, we have a conversion in the nucleus of an atom

Generally, there must be an excess of either the proton or a neutron in the nucleus of a radioactive atom

What we are saying here is that both do not have same values

Hence, what we have is that during a beta decay, there is a transformation of a proton to a neutron or a neutron to a proton, depending on which of the two are in excess

What this mean is that the one that changes to the other is largely dependent on which of the two is more than the other

That brings us to the principle of having a beta positive decay or a beta negative decay

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.