1.the 3 particles of the atom are:
a.

b.

c.
their respective charges are:
a.

b.

c.
2.the number of protons in one atom of an element determines the atom’s
____________________, and the number of electrons determines
____________________ of an element.
3.the atomic number tells you the number of ____________________ in one atom of an
element. it also tells you the number of ____________________ in a neutral atom of that
element. the atomic number gives the “identity” of an element as well as its location on the
periodic table. no two different elements will have the
____________________ atomic number.
4.the ____________________ of an element is the average mass of an element ’s naturally
occurring atom, or isotopes, taking into account the ____________________ of each isotope.
5.the ____________________ of an element is the total number of protons and neutrons in
the ____________________ of the atom.
6.the mass number is used to calculate the number of ____________________ in one atom of
an element. in order to calculate the number of neutrons you must subtract the
____________________ from the ____________________.
7.give the symbol and number of protons in one atom of:
lithium ______________ bromine ______________
iron ______________ copper ______________
oxygen ______________ mercury ______________
krypton ______________ helium ______________

Question

1.the 3 particles of the atom are:
a.

b.

c.
their respective charges are:
a.

b.

c.
2.the number of protons in one atom of an element determines the atom’s
____________________, and the number of electrons determines
____________________ of an element.
3.the atomic number tells you the number of ____________________ in one atom of an
element. it also tells you the number of ____________________ in a neutral atom of that
element. the atomic number gives the “identity” of an element as well as its location on the
periodic table. no two different elements will have the
____________________ atomic number.
4.the ____________________ of an element is the average mass of an element ’s naturally
occurring atom, or isotopes, taking into account the ____________________ of each isotope.
5.the ____________________ of an element is the total number of protons and neutrons in
the ____________________ of the atom.
6.the mass number is used to calculate the number of ____________________ in one atom of
an element. in order to calculate the number of neutrons you must subtract the
____________________ from the ____________________.
7.give the symbol and number of protons in one atom of:
lithium ______________ bromine ______________
iron ______________ copper ______________
oxygen ______________ mercury ______________
krypton ______________ helium ______________

Accepted Answer

### Question 1
#### Brief Explanations:
Atoms are composed of three main subatomic particles. Protons are positively charged, neutrons have no charge, and electrons are negatively charged.
#### Answer:
a. Proton
b. Neutron
c. Electron

Their respective charges are:
a. Positive (+)
b. Neutral (no charge)
c. Negative (-)

### Question 2
#### Brief Explanations:
The number of protons in an atom is the atomic number, which defines the element's identity. The number of electrons (in a neutral atom, equal to protons) and their arrangement determine the chemical properties, as electrons are involved in bonding.
#### Answer:
The number of protons in one atom of an element determines the atom’s **atomic number (identity)**, and the number of electrons determines the **chemical properties** of an element.

### Question 3
#### Brief Explanations:
Atomic number is equal to the number of protons in an atom. In a neutral atom, the number of electrons equals the number of protons. Each element has a unique atomic number, so no two elements share the same atomic number.
#### Answer:
The atomic number tells you the number of $\boldsymbol{	ext{protons}}$ in one atom of an element. It also tells you the number of $\boldsymbol{	ext{electrons}}$ in a neutral atom of that element. The atomic number gives the “identity” of an element as well as its location on the Periodic Table. No two different elements will have the $\boldsymbol{	ext{same}}$ atomic number.

### Question 4
#### Brief Explanations:
Atomic mass (average atomic mass) is the weighted average of the masses of an element’s isotopes, where the weighting factor is the relative abundance of each isotope.
#### Answer:
The $\boldsymbol{	ext{atomic mass (average atomic mass)}}$ of an element is the average mass of an element’s naturally occurring atom, or isotopes, taking into account the $\boldsymbol{	ext{relative abundance}}$ of each isotope.

### Question 5
#### Brief Explanations:
Mass number is the sum of protons and neutrons in the nucleus of an atom. The nucleus contains protons and neutrons, so mass number reflects the total mass - contributing particles in the nucleus.
#### Answer:
The $\boldsymbol{	ext{mass number}}$ of an element is the total number of protons and neutrons in the $\boldsymbol{	ext{nucleus}}$ of the atom.

### Question 6
#### Brief Explanations:
Mass number ($A$) = number of protons ($Z$) + number of neutrons ($N$). So, to find the number of neutrons, we rearrange the formula: $N=A - Z$. Thus, we subtract the atomic number (number of protons) from the mass number.
#### Answer:
The mass number is used to calculate the number of $\boldsymbol{	ext{neutrons}}$ in one atom of an element. In order to calculate the number of neutrons you must subtract the $\boldsymbol{	ext{atomic number (number of protons)}}$ from the $\boldsymbol{	ext{mass number}}$.

### Question 7
#### Brief Explanations:
The number of protons in an atom is equal to its atomic number. We use the periodic table to find the atomic number (and symbol) of each element:
- Lithium (Li) has an atomic number of 3, so 3 protons.
- Bromine (Br) has an atomic number of 35, so 35 protons.
- Iron (Fe) has an atomic number of 26, so 26 protons.
- Copper (Cu) has an atomic number of 29, so 29 protons.
- Oxygen (O) has an atomic number of 8, so 8 protons.
- Mercury (Hg) has an atomic number of 80, so 80 protons.
- Krypton (Kr) has an atomic number of 36, so 36 protons.
- Helium (He) has an atomic number of 2, so 2 protons.
#### Answer:
- Lithium: $	ext{Li}$, 3 protons
- Bromine: $	ext{Br}$, 35 protons
- Iron: $	ext{Fe}$, 26 protons
- Copper: $	ext{Cu}$, 29 protons
- Oxygen: $	ext{O}$, 8 protons
- Mercury: $	ext{Hg}$, 80 protons
- Krypton: $	ext{Kr}$, 36 protons
- Helium: $	ext{He}$, 2 protons

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