Question

25 review questions

1. what is an atom?
2. define an element.
3. what are subatomic particles?
4. name the three main subatomic particles.
5. where is the proton located in the atom?
6. what charge does a proton carry?
7. where is the neutron located in the atom?
8. what charge does a neutron carry?
9. where are electrons found in an atom?
10. what charge does an electron have?
11. why is the atom electrically neutral?
12. what is the nucleus of an atom?
13. which two subatomic particles are found in the nucleus?
14. which subatomic particle has the smallest mass?
15. what is the atomic number of an atom?
16. what is the atomic mass number?

Explanation:

1. An atom is the basic unit of matter, consisting of a nucleus surrounded by electrons.
2. An element is a pure substance made up of only one type of atom.
3. Subatomic particles are particles smaller than an atom, including protons, neutrons, and electrons.
4. The three main subatomic particles are protons, neutrons, and electrons.
5. Protons are located in the nucleus of the atom.
6. A proton carries a positive charge.
7. Neutrons are located in the nucleus of the atom.
8. A neutron carries no charge (is neutral).
9. Electrons are found in the electron - cloud surrounding the nucleus.
10. An electron has a negative charge.
11. An atom is electrically neutral because the number of protons (positive charges) equals the number of electrons (negative charges).
12. The nucleus of an atom is the central part, containing protons and neutrons.
13. Protons and neutrons are found in the nucleus.
14. The electron has the smallest mass among subatomic particles.
15. The atomic number of an atom is the number of protons in its nucleus.
16. The atomic mass number is the sum of the number of protons and neutrons in the nucleus.

Answer:

1. An atom is the basic unit of matter, consisting of a nucleus and electrons.
2. An element is a pure substance with one - type of atom.
3. Subatomic particles are particles smaller than an atom.
4. Protons, neutrons, electrons.
5. In the nucleus.
6. Positive charge.
7. In the nucleus.
8. No charge.
9. In the electron - cloud around the nucleus.
10. Negative charge.
11. Because the number of protons equals the number of electrons.
12. The central part containing protons and neutrons.
13. Protons and neutrons.
14. Electron.
15. The number of protons in the nucleus.
16. The sum of protons and neutrons in the nucleus.