The mass of an electron is

(1) equal to the mass of a proton

(2) equal to the mass of a neutron

(3) greater than the mass of a proton

(4) less than the mass of a neutron

How many uL are present in 250 mL of H20? (1 uL = 10^-6 Liters)

Is "diamonds are the hardest known substance" a physical property?

Are elements, compounds, or both made up of small invisible particles?

Which statement about a chemical reaction is true

A piece of copper is placed into silver nitrate. Given that the activity of copper is greater than that of silver, what will happen? A) A copper-silver compound will form. B) All three elements will combine to form a new compound.

A student states that non-metal atoms share their core electrons when they form covalent bonds. What is wrong with this statement? A. Atoms do not share electrons during covalent bonding. B.

Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?

What type of radiation is most likely to damage DNA? A. ionizing B. non-ionizing

Water vapor cools and comes together to form a cloud. This is an example of what change in state? condensation evaporation melting

Which group of the periodic table does this element most likely belong to