The electron configuration 1s^2 2s^2 2p^6 3s^2 describes the electrons of which element?

sodium

manganese

phosphorus

magnesium

Explain how you can estimate the number of neutrons in the atoms of an element.

What could you conclude if the enthalpy of the reaction has a positive sign?

The gas usually filled in the electric bulb is? 1. nitrogen 2. hydrogen 3. carbon dioxide 4. oxygen

How many atoms are in 0.8288 grams of sodium, Na? 1.670 x 10^25 atoms 1.147 x 10^25 atoms 2.170 x 10^22 atoms 3.159 x 10^22

If the number of particles is increased, the number of collisions per second

What is the difference between a 1s orbital and a 2s orbital is that

Why should distilled water be used when conducting chemical tests? Select all that apply. O Distillation removes most chemicals present in tap water that could give us false results.

2. How can you use mass and volume to find density of a substance?

Grayson wants to build an inexpensive shelter at his bus stop that he can stand in when it rains. What material would be best for building a shelter that is both strong and waterproof

A sample of gas has a volume of 0.600 L at a temperature of 303 k. If the volume is increased to 0.900 L, what is the new temperature?