If an elements atomic mass is 70 and it has 39 neutrons how many protons does it have?

Explain why the quantum number set (3,3,-2, + 1/2) is not possible for an electron in a ground-state atom

An alcohol consists of an "R" group combined with the:

What is the significance of atomic nuclear decay?

Two compounds that have the same molecular formula but different structural formulas are

Which would make the best model for the beak of a bird that eats seeds from the ground? A. dropper B. strainer C. toothpick D. tweezers

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

What is the function of the ribosome

How much energy, in joules, does 150.0 g of water with an initial temperature of 25 C need to absorb be raised to a final temperature of 75 C

What mass of oxygen is contained in a 5.8 g sample of NaHCO3?

Which statement correctly compares the number of chromosomes in a body cell to that in a sex cell of humans? A. A body cell has 21 chromosomes; a sex cell has 23 B. A body cell has 21 chromosomes; a sex cell has two C.