What do we call the horizontal rows on a periodic table?

Which of the following processes has an increase in entropy? A) Boiling a pot of water B) Freezing a sample of water C) Filtering sand out of a sample of water D) Synthesizing water from hydrogen and oxygen

If I have 325 mL of oxygen gas at a temperature of 25°C, and I heat it to a temperature of 75°C, what is the new volume (in mL) ?

What type of bond creates volatile liquids and gases

The granite rock shown above is an example of a. element b. a compound c. homogeneous mixture d. heterogeneous mixture

The element whose atomic number is 13 has how many valence electrons electron configuration

Which statements describe Rutherford's model of the atom? Select all that apply.

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. what volume of h2 is produced when 7.20 g of al reacts at stp?

Which is most likely the result of millions of metal atoms crowding together so that molecular orbitals become combined?

How is the Kyoto Protocol enforced A. By using carbon credits and debits B. By banning aerosols C. By banning CFCs D. By monitoring the ozone hole

What are all the elements to the left of the zigzag line in a periodic table called?