How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? Choose all that apply.

(A) Transition metals

(B) Noble gases

(C) Group 6, Period 4

(D) Group 4, Period 6

What is the mass of 1.0 x 10-3 mole of Zn? 3.9 x 1022 0.065 0.000015

What are three elements that have similar chemical properties to oxygen

How often does the sun have pole reversal

13 Which atom in the ground state has a stable electron configuration? (1) carbon (3) neon (2) magnesium (4) oxygen

What is the molarity of a solution made by adding 1.300 g of NaOH to a 250-mL volumetric flask and diluting to the mark?

Given the reaction: 2 Na (s) + Cl 2 (g) → 2 NaCl (s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl 2 ≡ 2 mol NaCl. True or false?

Taking a cross section of a fiber can reveal what?

A? relay is a relay that not only maintains its contacts in the last position without a continuously energized coil, but also with a mechanical mechanism or remnant magnetism until it resets electrically.

What is a "curie"? A. standard charge of alpha particles B. mass of one alpha particle C. unit of radioactive disintegration D. a unit of gamma radiation

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will a. remain stable. b. change into a different element altogether. c. emit neutral particles and no energy. d. none of the above