True or false. elements in the same period have the same number of valence electrons

Which of the following examples is a molecule with a covalent bond? a. KCl b. CO c. RbBr d. BeO

How many moles are found in 600 grams of iron

What new inforamtion can you add the your definition of physical change?

Group 8A of the periodic table contains the A. most reactive nonmetals. B. least reactive nonmetals. C. most reactive metals. D. least reactive metals.

Which uses of iron are due to its chemical properties? Select two options. producing colored sparks in fireworks changing from liquid to gas at 2,862°C rusting in the presence of water and oxygen changing from solid to liquid if heated to 1,538°C

Which one doesnt belong in the list below? A. a meter B. one liter C. One centimeter D. one kilometer

Which elements did curies discover

When rubidium metal is exposed to air, two atoms of rubidium, Rb, combine with one atom of oxygen. If 1.98 grams of rubidium is exposed to air, what will be the mass of the product in grams

Fission reactions can get of of control without what taking place?

In which main energy level does the 's' sublevel first appear? K (first main energy level) L (second main energy level) M (third main energy level) N (fourth main energy level)