What are the element represented by [He]2s2

A ball is rolling across the floor. How could you apply an unbalanced force to change the speed or direction of the ball?

Salt dissolving in water is a physical change. True or False

The molecular weight of NaCl is 58.44 grams/mole. If you had a 1.0 molar solution (1.0 M), you would have to put 58.44 g of salt in 1.0 liter of solution. How many moles of NaCl would you have in 10 0 mL of this solution

If all the particles in a metal spoon start moving faster, how has the spoon's temperature change?

I am a gas with the mass number of 19

Hen an electric current passes through liquid water, hydrogen gas passes accumulates at one electrode and oxygen accumulates at the other. Which of the following is true? A) A physical change has occurred, with energy is being absorbed.

Explain what happens to water when heat energy is absorbed a. Ice melts b. Liquid water freezes c. Water vapor condenses

Will fluorine form an anion or a cation? Why?

An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has 1). More protons than neutrons 2). More neutrons than protons. 3) a total of 2 valence electrons. 4).

When bases dissolve in water they release what type of negative ion?