Question

1. the atomic mass is a decimal number because it is actually an average (mean) of different forms/isotopes of an atom. we round this mass off to find the number of neutrons in atoms. use the table to find what the atomic mass number should be for the given elements. do not use the periodic table to do this part! then look up the name of the element using the periodic table.

*remember what identifies the element. look back at #17 if you are not sure.

Explanation:

Step1: Calculate atomic mass

Atomic mass = number of protons + number of neutrons.
For the first row: \(6 + 6=12\)
For the second row: \(6 + 8 = 14\)
For the third row: \(52+58 = 110\)
For the fourth row: \(52 + 59=111\)
For the fifth row: \(52+60 = 112\)

Step2: Identify elements

The number of protons identifies the element.

• For 6 protons: Carbon (\(C\))
• For 52 protons: Tellurium (\(Te\))

Answer:

Number of protons	Number of neutrons	Number of electrons	Atomic mass	Element
6	8	6	14	Carbon (\(C\))
52	58	52	110	Tellurium (\(Te\))
52	59	52	111	Tellurium (\(Te\))
52	60	52	112	Tellurium (\(Te\))