Protons Neutrons And Electrons Practice Worksheet 2 Answer Key ... - Free Printable

Problem Overview:

The task involves identifying properties of elements based on their periodic table information. The elements are represented in various ways, such as symbols, atomic numbers, and electron configurations. The goal is to fill in the missing information for each element.

Solution:

#### Element 1:
- Symbol: H
- Chemical Symbol: H (Hydrogen)
- Atomic Number: 1
- Atomic Mass: Approximately 1.008 amu
- Protons: 1
- Neutrons: 0 (Most common isotope has no neutrons)
- Electrons: 1

#### Element 2:
- Symbol: Y
- Chemical Symbol: Y (Yttrium)
- Atomic Number: 39
- Atomic Mass: Approximately 88.906 amu
- Protons: 39
- Neutrons: 50 (Calculated as Atomic Mass - Protons ≈ 89 - 39 = 50)
- Electrons: 39

#### Element 3:
- Symbol: Rn
- Chemical Symbol: Rn (Radon)
- Atomic Number: 86
- Atomic Mass: Approximately 222.017 amu
- Protons: 86
- Neutrons: 136 (Calculated as Atomic Mass - Protons ≈ 222 - 86 = 136)
- Electrons: 86

#### Element 4:
- Symbol: He
- Chemical Symbol: He (Helium)
- Atomic Number: 2
- Atomic Mass: Approximately 4.003 amu
- Protons: 2
- Neutrons: 2 (Calculated as Atomic Mass - Protons ≈ 4 - 2 = 2)
- Electrons: 2

#### Element 5:
- Symbol: O
- Chemical Symbol: O (Oxygen)
- Atomic Number: 8
- Atomic Mass: Approximately 16.000 amu
- Protons: 8
- Neutrons: 8 (Calculated as Atomic Mass - Protons ≈ 16 - 8 = 8)
- Electrons: 8

#### Element 6:
- Symbol: Li
- Chemical Symbol: Li (Lithium)
- Atomic Number: 3
- Atomic Mass: Approximately 6.941 amu
- Protons: 3
- Neutrons: 4 (Calculated as Atomic Mass - Protons ≈ 7 - 3 = 4)
- Electrons: 3

Final Answers:

1. H (Hydrogen)
- Chemical Symbol: H
- Atomic Number: 1
- Atomic Mass: 1.008 amu
- Protons: 1
- Neutrons: 0
- Electrons: 1

2. Y (Yttrium)
- Chemical Symbol: Y
- Atomic Number: 39
- Atomic Mass: 88.906 amu
- Protons: 39
- Neutrons: 50
- Electrons: 39

3. Rn (Radon)
- Chemical Symbol: Rn
- Atomic Number: 86
- Atomic Mass: 222.017 amu
- Protons: 86
- Neutrons: 136
- Electrons: 86

4. He (Helium)
- Chemical Symbol: He
- Atomic Number: 2
- Atomic Mass: 4.003 amu
- Protons: 2
- Neutrons: 2
- Electrons: 2

5. O (Oxygen)
- Chemical Symbol: O
- Atomic Number: 8
- Atomic Mass: 16.000 amu
- Protons: 8
- Neutrons: 8
- Electrons: 8

6. Li (Lithium)
- Chemical Symbol: Li
- Atomic Number: 3
- Atomic Mass: 6.941 amu
- Protons: 3
- Neutrons: 4
- Electrons: 3

Explanation:

- Atomic Number: This is the number of protons in the nucleus of an atom and uniquely identifies the element.
- Atomic Mass: This is the weighted average mass of all isotopes of an element, typically given in atomic mass units (amu).
- Protons: Equal to the atomic number.
- Neutrons: Calculated as Atomic Mass - Protons (rounded to the nearest whole number for most stable isotopes).
- Electrons: In a neutral atom, the number of electrons equals the number of protons.

Each element's properties were determined using the periodic table and basic atomic structure principles. The answers are consistent with standard values for these elements.

Final Answer:
\boxed{
\begin{array}{c|c|c|c|c|c}
\text{Element} & \text{Symbol} & \text{Atomic Number} & \text{Atomic Mass} & \text{Protons} & \text{Neutrons} & \text{Electrons} \\
\hline
1 & H & 1 & 1.008 & 1 & 0 & 1 \\
2 & Y & 39 & 88.906 & 39 & 50 & 39 \\
3 & Rn & 86 & 222.017 & 86 & 136 & 86 \\
4 & He & 2 & 4.003 & 2 & 2 & 2 \\
5 & O & 8 & 16.000 & 8 & 8 & 8 \\
6 & Li & 3 & 6.941 & 3 & 4 & 3 \\
\end{array}
}