nessm6214 nessm6214

04-03-2022
Chemistry

contestada

An atom of a mystery element contains 7 protons, 7 neutrons, and 7 electrons.
What is the mass number?
A. 14
B. 7
C. 0
D. 21

Respuesta :

05-03-2022

A-14

Explanation:

Mass number (MN) = Proton number + Neutron number

MN=7+7

MN=14

Answer Link

Otras preguntas

Evaluate a + 6 for a = 10.

Which example describes natural rights?

Find a•b. a=<2,4>, b= <2,5>

Please Help Me 15 Points

A radioactively labeled protein is made by cells and followed through the various organelles in the secretory pathway. After six hours, all of the radioactivity

picking a blue shirt from a drawer with 8 blue shirts and 2 white shirts

Which sentence reflects the central idea of the passage? Everywhere you look, advertisements tempt you to eat more junk food. It may be tasty, but junk food ca

New York received 40 centimeters of snow in 20 hours. How many centimeters fell per hour?

Simplify the following expression-4+3y-10+12x-y

What were some successful programs and some unsuccessful programs from President Johnson’s great society?