What is the charge on he helium atom? Explain your reasoning. (A helium atom has two electrons, two protons, and two neutrons.)

What evidence is there that indicates ink is a mixture?

True or false: when a catalyst is added to a chemical reaction the particles collide with more energy

How do metals on the periodic table tend to achieve the octet rule?

The diagram shows an electron shell model of a sodium atom. A central purple circle labeled N a has 3 concentric rings around it. The inner ring has 2 small green spheres. The middle ring has 8 small green spheres.

What did Schrodinger's quantum mechanical model eventually show?

Why reducing power of elements increase, on moving down a group?

Which of the following is not a result of air pollution? A. Smog B. Breathing problems C. Global warming D. Soil erosion

rank the following list of aqueous solutions and solvents according to decreasing vapor pressure the substance with the higher vapor pressure should be placed at top 0.10 M glucose pure water 0.050 M urea 0.20 M sucrose

What does the p mean in 1s22s22p63s1?

Why are alkaline earth metals and alkali metals found in nature by themselves?