Why are electrons NOT included in the measurement of the mass of an atom?

A. Because they are very light and their mass is almost negligible.
B. Because the chemists think
they are not important to the atom
C. Because they move very fast and in random movements
D. Because they are not found in the nucleus

Which of the following statements is TRUE about condensation?
A. A statement of chemical symbols that shows what happens during a chemical reaction.
B. The process by which particles leave a gas and become a liquid.
C. The process by which particles leave a liquid and become a gas.
D. The process by which a solid changes directly into a gas

The element X and Y reacts to make a compound. After the reaction was completed, what would likely happen to the number of atoms of element X?
A.It will disappear
B.It will be doubled
C.It will increase
D.It will remain the same

An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.

2. why B?

Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools, and loses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.

3. Why D?

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products. An arrow is drawn between the reactants and products to indicate the direction of the chemical reaction, though a chemical reaction is not always a "one-way street," as we'll explore further in the next section.

Hope this helps good luck and stay safe always <3