If the nucleus of an atom contains 12 protons how many electrons are there in a neutral atom

Why do planets in our solar system stay in their positions A) The sun's gravity keeps them in place. B) The sun's radiation keeps them there. C) Friction with the atmosphere keeps them from escaping. D) They travel the same distance from each other.

How many molecules are in 240.0 grams of cobalt (II) chloride, CoCl2

How do you convert the number of molecules of a substance to the number of moles? a. add Avogardo's number b. subtract Avogardo's number c. multiply Avogardo's number d. devide Avogardo's number

Write a sentence that uses the words "mass extinction" correctly

3. How many moles of carbon dioxide gas, CO2, are there in 2.8 L of this gas at STP?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.

A nickel atom (Ni) has a mass numbet of 61. how many neutrons does the atom have