Human Physiology Chpt 2
1. What is an atom?: •Basic unit of a chemical element.
-An atom is made up of protons, neutrons, and electrons.
2. What does numerous atoms make up?: Element
3. What does combining elements make up?: molecules
4. What are the three main elements found in the human body?: carbon, oxygen, and
hydrogen make up more than 90% of the body's mass.
5. What is an atom made up of?: protons, neutrons, electrons
6. What are protons, neutrons, and electrons?: Protons= particle in nucleus with a positive charge
Neutrons= neutral particle inside the nucleus of an atom
Electron= particle with an electric charge of -1 that surrounds the nucleus of an atom
7. What is the center of an atom?: nucleus
8. What is atomic number?: the number of protons in an atom
1/9
,9. What is atomic mass?: The mass of protons and neutrons in one atom of an ele ment
10. What is an isotope?: Atoms of the same element with the same number of protons but have different
numbers of neutrons
11. T/F: the number of electrons = protons in a neutral element.:
12. What happens when we add/subtract electrons?: If an atom or molecule gains or loses one
or more electrons, it acquires an electrical charge and becomes an ion.
13. When an atom loses an electron, through chemical bonding it becomes: a
cation: meaning the atom is now positively charged
14. When an atom gains an electron it becomes: a anion: meaning the atom is now negatively
charged
15. What is in the center of the nucleus in an atom?: Protons and neutrons
16. What does an atomic number mean on an element?: It means that is the number of
protons it has
2/9
, 17. How do you calculate the number of atomic mass?: Protons + Neutrons
3/9
1. What is an atom?: •Basic unit of a chemical element.
-An atom is made up of protons, neutrons, and electrons.
2. What does numerous atoms make up?: Element
3. What does combining elements make up?: molecules
4. What are the three main elements found in the human body?: carbon, oxygen, and
hydrogen make up more than 90% of the body's mass.
5. What is an atom made up of?: protons, neutrons, electrons
6. What are protons, neutrons, and electrons?: Protons= particle in nucleus with a positive charge
Neutrons= neutral particle inside the nucleus of an atom
Electron= particle with an electric charge of -1 that surrounds the nucleus of an atom
7. What is the center of an atom?: nucleus
8. What is atomic number?: the number of protons in an atom
1/9
,9. What is atomic mass?: The mass of protons and neutrons in one atom of an ele ment
10. What is an isotope?: Atoms of the same element with the same number of protons but have different
numbers of neutrons
11. T/F: the number of electrons = protons in a neutral element.:
12. What happens when we add/subtract electrons?: If an atom or molecule gains or loses one
or more electrons, it acquires an electrical charge and becomes an ion.
13. When an atom loses an electron, through chemical bonding it becomes: a
cation: meaning the atom is now positively charged
14. When an atom gains an electron it becomes: a anion: meaning the atom is now negatively
charged
15. What is in the center of the nucleus in an atom?: Protons and neutrons
16. What does an atomic number mean on an element?: It means that is the number of
protons it has
2/9
, 17. How do you calculate the number of atomic mass?: Protons + Neutrons
3/9
