Question

56ni
28

1. elemental symbol:
2. atomic number:
3. number of protons:
4. mass number:
5. number of electrons:

Explanation:

Step1: Identify the elemental symbol

The elemental symbol is given as \( \text{Ni} \).

Step2: Determine the atomic number

The atomic number is the subscript in the notation, which is \( 28 \).

Step3: Find the number of protons

The number of protons is equal to the atomic number, so it is \( 28 \).

Step4: Calculate the mass number

The mass number is the superscript in the notation, which is \( 56 \).

Step5: Calculate the number of electrons

For a neutral atom, the number of electrons is equal to the number of protons (atomic number), so it is \( 28 \).

Answer:

1. \( \text{Ni} \)
2. \( 28 \)
3. \( 28 \)
4. \( 56 \)
5. \( 28 \)