The last element in any period always has: A. two electrons in the outermost energy level B. its outer energy level completed C. the properties of an inert gas D. the lowest atomic weight because it is a gas

How many grams are in 5.00 moles of lead

Atomic number of Element A is 11 and that of element B is 9. Write the formula of the compound formed when A combines with B. b) Find the group of these elements.

Which of these are a bronsted acid, a bronsted base or are both the bronsted acid and the bronsted base? PO4^3- ClO2- NH4+ HCO3- H2PO4-

Which of the following statements is true for a scientific theory? A) It is based on empirical evidence. B) It is based on only one experiment. C) It is investigated over a short period. D) It is verified by only one reowned scientist.

If an atom has 4 electrons outside of its nucleus, which combination of protons and neutrons would result in a neutral atom?

Which of the following elements is the most stable element? argon, manganese, phosphorus, robidium

List results of Chemical Reactions.

When you measure something in meters cubed, you are measuring

Low density: low pressure: high density Is which. evaporation? water vapor? condensation / liquid water

Which structures are found on sponges? pores medusae polyps stinging cells