Which one of the following tells the physical state (matter) of an element at room temperature?
a. atomic number
b. the color of the chemical symbol
c. atomic mass
d. element name
which of the following elements is the most reactive?
a. k
b. kr
c. fe
d. cu
which of these elements is least metallic?
a. k
b. kr
c. fe
d. cu
which of these groups are all nonmetals?
a. k, ca, sc
b. se, br, kr
c. v, cr, mn
d. as, se, br

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?