Atoms (protons, neutrons, electrons, mass number and atomic number, isotopes and ions) 1
(1 pts) An atom with Z = 12 and A = 25 contains
protons,
electrons, and
neutrons

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

- decrease the number of plants and animals living in the water.

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.  

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).