Defining Balance in Chemistry What does it mean for a chemical equation to be balanced?
O The number of atoms is the same for both the reactants and products.
The number of each type of atom is the same for both the reactants and products.
O The number of different molecules has to be the same for both the reactants and products.

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete