Hydrogen is a pure substance represented by the chemical symbol . Which of the following best describes hydrogen? A.
Hydrogen is an element made of two or more kinds of atoms.
B.
Hydrogen is a compound made of only one kind of atom.
C.
Hydrogen is an element made of only one kind of atom.
D.
Hydrogen is a compound made of two or more kinds of atoms.

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?