Question

(7th) unit 3 - the atom
directions: write neatly with pencil. answers do not need to be in complete sentences.
question answer
1 what is the smallest unit of matter that has the chemical properties of an element?
2 what are the three subatomic particles in the atom?
3 what subatomic particle(s) are in the nucleus? + and -
4 where are the electrons located?
5 what is the overall charge of the nucleus (positive, negative, neutral)? why? positive, the presence of
6 what does amu stand for? atomic mass unit
7 amu is an \arbitrary unit.\ what is an arbitrary unit? can it be measured in the laboratory? it is a relative unit of m based on a ratio no
8 why does the electron have a mass of 0 amu? matter must have mass and volume.
9 what subatomic particle(s) have a mass of 1 amu?
10 what do we call an element with no charge?
(7th) u3 hw1 - the atom

Explanation:

1. An atom is the smallest unit of matter with the chemical properties of an element.
2. Protons, neutrons, and electrons are the three sub - atomic particles in an atom.
3. Protons (positive) and neutrons (neutral) are in the nucleus.
4. Electrons are located outside the nucleus in electron shells.
5. The nucleus is positively charged because it contains protons which are positively charged and neutrons which are neutral.
6. AMU stands for Atomic Mass Unit.
7. An arbitrary unit is a relative unit of measure based on a ratio and it cannot be directly measured in the laboratory in an absolute sense.
8. The electron has a very small mass compared to protons and neutrons, so it is often approximated as 0 AMU for simplicity in basic atomic models.
9. Protons and neutrons have a mass of approximately 1 AMU.
10. An element with no charge is called a neutral element, which has an equal number of protons and electrons.

Answer:

1. Atom
2. Protons, neutrons, electrons
3. Protons, neutrons
4. Outside the nucleus in electron shells
5. Positive; because it contains positively - charged protons and neutral neutrons
6. Atomic Mass Unit
7. A relative unit of measure based on a ratio; No
8. Its mass is very small compared to protons and neutrons, so it is approximated as 0 AMU in basic models
9. Protons, neutrons
10. Neutral element