What is the sum of protons and neutrons in an atomic nucleus?

A: Mass Number

B: Charge Number

C: Balance Number

D: Atomic Number

A piece of platinum metal with a density of 21.5 g/cm3 has a volume of 8.89 cm3. what is its mass?

The mass of vitamin D in your blood is 50.0 grams. What is this measure in pounds? (answer in scientific notation)

The periodic table of elements is organized by the number of what?

The osmotic pressure is found to depend on the concentration of the solution. What way, directly or inversely

Is kerosene a fossil fuel?

Does beryllium or sodium have the same inside electron arrangement as magnesium

How do carbohydrates relate to organic chemistry

Periodic table, chemistry questions who discovered lanthanides. how did they discover it, when did they discover it.

A flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5kPa. What pressure would have been required in order for the volume of the gas to have been 90.0 cm^3 at constant temperature?

Which change is most likely to occur when a molecule of H2 and a molecule of I2 collide with proper orientation and sufficient energy? 1. a chemical change, because a compound is formed 2. a chemical change, because an element is formed 3.