Question

1. give the mass number of each isotope.

a. be with 5 neutrons
b. ga with 39 neutrons
c. si with 16 neutrons
d. ti with 26 neutrons

Explanation:

Step1: Recall the formula for mass number

Mass number \(A = Z+N\), where \(Z\) is the atomic number (number of protons) and \(N\) is the number of neutrons.

Step2: Find the atomic number of each element

• For Be (Beryllium), \(Z = 4\) (from the periodic table).
• For Ga (Gallium), \(Z = 31\) (from the periodic table).
• For Si (Silicon), \(Z = 14\) (from the periodic table).
• For Ti (Titanium), \(Z = 22\) (from the periodic table).

Step3: Calculate the mass number for each isotope

• For Be: \(A=Z + N=4 + 5=9\)
• For Ga: \(A=Z + N=31+39 = 70\)
• For Si: \(A=Z + N=14 + 16=30\)
• For Ti: \(A=Z + N=22+26 = 48\)

Answer:

a. \(9\)
b. \(70\)
c. \(30\)
d. \(48\)