What element has 81 protons in the nuclei of atoms

A copper piece cannot be made a magnet ... Why?

For each of the following chemical reactions, calculate the mass of the underlined reactant that is required to produce 1.000 g of the underlined product.

A neutral atom of the element that comes just before platinium in the periodic tablet has

The difference between speed and velocity most involves A. Direction B. Amount C. Different units D. Acceleration

A backyard swimming pool holds 165 cubic yards (yd3) of water. what is the weight of the water in pounds?

What is the total number of atoms in the following formula? CaBr2 4 3 2 1

Object A with a mass of 500 kilograms hits stationary object B with a mass of 920 kilograms. If the collision is elastic, what happens after the collision? A) Both object A and object B move forward but with different velocities.

A young man walks daily through a gridded city section to visit his girlfriend, who lives m blocks East and nblocks North of where the young man resides.

Aliens from planet Moby have three alleles for skin color: R (red) W (white) and B (Blue). If all of these alleles are codominant and aliens on planet moby can only inherit two alleles for a gene, what are the six possible genotypes for skin color

The difference between two numbers is 15. When twice the smaller number is subtracted from three times the larger number, the difference is 58. What is the larger number?