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

You recently discovered a new element, and find that this particular element has one electron in its outer energy level. what would you expect will happen to an atom of this element if placed in water?

What are some of the body external defenses

What is the solute found in carbonated beverages that gives them their bubbly taste? A. carbon dioxide B. sugar C. corn syrup D. water

In the reaction MgCl2 + 2KOH Mg (OH) 2 + 2KCl, if 3 moles MgCl2 are added to 4 moles KOH, what determines how much Mg (OH) 2 is made? A. The amount of MgCl2 + KOH B. The amount of KCl C. The amount of MgCl2 D. The amount of KOH

What is the mass in grams of 2.25 mol of the element iron fe

Uranium - 235 is used in nuclear fission. determine the number of protons and neutrons in uranium - 235

Calculation of Percent Composition Analysis of a 12.04-g sample of a liquid compound composed of carbon, hydrogen, and nitrogen showed it to contain 7.34 g C, 1.85 g H, and 2.85 g N. What is the percent composition of this compound?

A substance is tested with litmus paper. the blue litmus paper remains blue while the red litmus paper remains red. what can you conclude about the substance?

The density of iron = 7.86 g/cm^3, what is the volume of 150g of iron

What alkyl halide forms the following alkene as the only product in an elimination reaction?