Which has the greater density? air at sea level air or at 20 km altitude?

Which is a property of a neutron? A) 0 charge B) + 1 charge C) - 1 Charge D) Essentially no mass

Which planet has the longest year and why?

What are the seven properties of metal?

Indicate whether each statement is true or false. Sort these statements into the proper categories. A) NaCl dissolves in water but not in benzene (C6zH6) because benzene is denser than water.

An atom of nickel has a mass number of 58. how many neutrons are in its nucleus?

Luis set a glass of ice water out side is the sunshine. when he looked at the glass 10 minutes later, the contents had changed. what kind of change happened to the ice water? A. evaperation B. conduction C. chemical change d. sudden change

A substance is considered to have a smaller surface area when ... A. it is a fine powder B. it is in large chunks C. you have a small amount of the substance D. you have a large amount of E. the substance

Which is the noble gas notation for chlorine? A-[Ne] 4s2 4p5 B-[Ne] 3s2 3p5 C-[Ne] 3s2 3p3 D-[Ne] 3p2 3p5

Is argon long hand or noble gas

Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five simplest elements, why are they rare compared to many heavier elements?