If an element with an atomic number of 51 and an atomic mass of 121, how many neutrons does it have?

A 2200 kilogram car is accelerating at 3.4 m/s/s. what is the NET force?

When the area over which pressure is applied is increased, a. the pressure decreases. b. the force on that area increases. c. the pressure increases. d. the pressure first increases and then decreases.

A ___ check conducted at drop off time is an essential practice

The number of protons plus the number of neutrons in an atom is called

How acceleration and gravitation (acceleration) are related/different?

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?