Erbium (Er) is element 68 on the periodic table. A sample contains 5.04*1023 atoms of Er. Calculate the amount of Er.

Choose all the answers that apply. Calcium (Ca) has two electrons in its outermost shell. Calcium: is a metal is a nonmetal fills its shell by giving up two electrons fills its shell by gaining six electrons becomes a negatively charged ion becomes

How does the structure of the pencil relate to its function?

Which subatomic particle has virtually no mass but accounts for the volume of the atom?

Place each scenario under the correct type of friction swimming Static Friction Kinetic Friction Fluid Friction books on a desk riding a bike skydiving moving furniture a parked car

Can someone give me brief background info about chromatography experiment?

Witch type of crust is thick and contains granite

A chemical base may be defined as a compound which contributes hydroxide ions or increases the OH concentration when dissolved in water. True False

Correct name for LiCl

What is anisotropy. Explain briefly with example.

Which is measured using a calorimeter