How many atoms of fluorine are in ZrF4

Whose atomic model could be described as a positive, solid sphere in which electrons are disbursed? A) Rutherford B) Dalton C) Thomson D) Mendeleev.

Which energy level has the least energy? n=1 n=3 n=5 n=7

Which of the following presidential candidates was nominated by self-announcement? a. Al Gore b. Woodrow Wilson c. Gerald Ford d. Ross Perot

What does Alpha Radioactivity mean?

Which of the following would have the highest terminal fall velocity? silt topsoil clay small pebbles

What do many bases have in common? A. They often release oxygen gas. B. They often form hydrogen ions. C. They often release hydrogen gas. D. They often form hydroxide ions.

What is 3 tenths+4tenths

A lunar eclipse can only occur at which lunar phase? And what about a solar eclipse?

Where are the transition metals on the periodic table? A. In two rows, separated from the rest of the table B. In the second column C. In the first column D. In columns 3 - 12 in the center of the table

A spherical ball of lead has a diameter of 2.5 cm. What is the mass of the sphere if lead has a density of 11.34 g/cm3? (The volume of a sphere is (43) πr3 where r is the radius.)