Word Bank: Mixtures, Compounds, Matter, Homogeneous, Element, Substance, Heterogeneous 1have only one type of matter and cannot be physically separated
2. are made up of multiple things and the different parts are easily distinguishable.
3.are two or more elements chemically bonded together.
4.are made up of multiple types of matter and are classified based on how thoroughly blended they are.
5. are defined as having all the atoms exactly the same. Cannot be broken down into smaller parts.
6.contains multiple types of matter, but they are distributed evenly throughout.

1. Element

2. Heterogeneous mixture

3. Compound

4. Mixture or Substances

5. Elements

6. Homogeneous mixture

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d