Electrons orbit the nucleus in specified energy

Which other elements contain the same number of outer electrons as sodium

The following conditions exist in a bacterium and its environment. Environment: 5M NaCl; 1M glucose Inside cell: 3M NaCl; 10M glucose The bacterium needs more glucose in the cell. True or false.

What are the amounts of molecules in 19 g flourine

When an atom of phosphorus becomes a phosphide ion (P3-), the radius (1) decreases (2) increases (3) remains the same?

What state is a liquid to a solid

What is the molarity of a solution prepared by dissolving 1.56 g of gaseous hcl (molar mass = 36.5 g into enough water to make 26.8 ml of solution?

Elementary row operations on an augmented matrix never change the the solution set of the associated linear system. True or False?

Element A has an electronegativity of 2.20. Element B has an electronegativity of 3.44. The bond of molecule AB is then best described as a:

Which of the following solutions would you expect not to conduct electricity?

The week of Feb. 29, 2016, PBS aired a documentary on sending humans halfway to space in the late 1950's using balloons. They filled different balloons with different gases - some with H2 and some with He. Which balloon should go higher? Why?