Question

electrons:
number under the nom
say no same.
12.
mass number:
element name:
element symbol:
13.
mass nu
elemen
elemen

Explanation:

Step1: Recall Mass Number Formula

Mass number ($A$) is the sum of protons ($p$) and neutrons ($n$), so $A = p + n$.

Step2: Identify Protons and Neutrons

From the diagram, protons ($p$) = 76, neutrons ($n$) = 114.

Step3: Calculate Mass Number

Substitute values: $A = 76 + 114 = 190$.

Step4: Identify Element from Protons

Atomic number ($Z$) = number of protons = 76. The element with $Z = 76$ is Osmium (Os).

Answer:

Mass Number: $\boldsymbol{190}$
Element Name: $\boldsymbol{\text{Osmium}}$
Element Symbol: $\boldsymbol{\text{Os}}$