Question

an atom has 26 protons, 30 neutrons, and 26 electrons. what is its mass number? 26 56 52 30 match the following descriptions with its corresponding subatomic particle. protons neutrons electrons positive charge negative charge has no charge fill in the chart: has mass has no mass neutrons electrons protons

Explanation:

Step1: Recall mass - number formula

The mass number (A) of an atom is the sum of the number of protons (p) and neutrons (n). The formula is $A=p + n$.

Step2: Identify values of p and n

Given that the number of protons $p = 26$ and the number of neutrons $n=30$.

Step3: Calculate mass - number

Substitute the values into the formula: $A=26 + 30=56$.

For the matching - part:

• Protons have a positive charge.
• Electrons have a negative charge.
• Neutrons have no charge.

For the chart - filling part:

• Neutrons have mass.
• Electrons have very little mass compared to protons and neutrons, but in a basic sense for this context, they have mass.
• Protons have mass.

Answer:

For the first question: B. 56
For the matching part:
Positive charge: Protons
Negative charge: Electrons
Has no charge: Neutrons
For the chart - filling part:
Neutrons: Has mass
Electrons: Has mass
Protons: Has mass