Which symbol represents a particle that has the same total number of electrons as S2-?

A) O2-

B) Si

C) Se2-

D) Ar

How many moles (of molecules or formula units) are in each sample? Part A 42.37 g CF2Cl2 Express your answer to four significant figures.

What is the relationship between atomic mass and relative abundance of isotopes?

Which does not describe the relationship between the nucleus and the electron cloud of an atom? a. The electron cloud takes up much more space than the nucleus. b. he masses of the nucleus and electron cloud are balanced. c.

10) Consumers, producers, and decomposers are all

Which idea did john dalton include in his atomic theory? a. all atoms are the same size. b. atoms of the same element are identical. c. each atom has a dense, positive nucleus. d. atoms can gain or lose electrons to become ions.

Calculate the number of H atoms in 0.190 mole C 6 H 14 O .

What fuel is produced by the electrolysis of water? chlorine gas hydrogen gas natural gas oxygen gas

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?