Which element is a metalloid?

a. argon (ar)

b. silicon (si)

c. potassium (k)

d. magnesium (mg) ?

Metals lose electrons under certain conditions to attain a noble-gas electron configuration. how many electrons must be lost by the element mg?

What is the Molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution? (1) 1 M (3) 0.04 M (2) 2 M (4) 0.5 M

You are trying to dilute antifreeze to put in your car. You use 1.00 L of the antifreeze with a concentration of 9.24 M. You add water until the volume is 3.00 L. What is the molarity of the diluted antifreeze solution?

Which units represent density? Select all that apply A. cm³ B. g/m³ C. g/cm³ D. cm³/gm E. kg/L F. kg/cm³ G. mL/cm³

How are linear, trigonal planar, and bent molecular shapes similar? How are they different?

Which atoms are most likely to form covalent bonds?

Which phrase is the best description of weathering? A-Compacting Rocks B-Cementing Rocks Together C-Crystallizing to form minerals D-Breaking Rocks into fragments by physical or chemical means

Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentration of 0.000 1M? Show your work.

Which orbital notation represents a noble gas in the ground state

c. When we heat water up by the Bunsen burner, what temperature is the boiling water? After 10 minutes