Groups run up and down or top to bottom while periods Run side to side or cross.

true or false?

Is it possible to have a relative atomic mass less then 24 or more than 26

A gas occupying a volume of 25 ft3 weighs 3.5 lbf on the moon, where the acceleration of gravity is 5.47 ft/s2. determine its weight, in lbf, and density, in lb/ft3, on mars, where g = 12.86 ft/s2.

If the volume of a container of gas is reduced what will happen to the pressure?

What element on the periodic table has a mass number of 50.9?

The law of conservation of mass tells us, in part, that matter is neither created nor destroyed. How can the law of conservation of mass for a chemical reaction be expressed?

Aspirin has a formula c9h8o4. what is the molar mass of aspirin? 1. 95 g 2. 220 g 3. 180 g 4. 325 g

Which of these are ionic compounds?

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

In the fourth century bc Greek scholars rejected Democritus ideas about the atom. This rejection was mostly based on?

An element X has two isotopes. X-15 has 7 protons and 8 neutrons. Determine the atomic number and mass number of the second isotope, which has 10 neutrons in its nucleus. a. atomic number = 8; mass number = 9 b. atomic number = 8; mass number = 17 c.