Which is a characteristic of colloids? Which one?
A. Are homogeneous mixtures
B. Have large dispersed particles
C. Will settle out over time
D. Are made up of at least two substances

the answer is D. Are made up of at least two

Explanation:

took the test on edge

these nuts

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.