Chem Ch1&2 Exam

Mass Number

Protons + Neutrons

How many protons, neutrons and electrons are there in a neutral atom of carbon-14?

Protons- 6 Neutrons- 8 Electrons- 6

Compound

A compound is a pure substance that is composed of two or more elements. All of the molecules in a pure substance are the same. The sample may be a solid, a liquid, a gas, or a mixture of states.

How many protons and neutrons are there in the nucleus of an atom that has an atomic number of 83 and a mass number of 214 ? What is the element?

Bi P- 83 N- 131

How many protons, neutrons and electrons are there in a neutral atom of the isotope with the nuclear symbol: 13 N 7

13 - Mass # 7 - Atomic Number p- 7 n- 6 e- 7

Pure Substance

All molecules are identical

Element

An element is a pure substance that is composed of only one kind of atom. The atoms may be combined to form molecules. As long as all of the atoms are the same, the substance is an element. The sample may be a solid, a liquid, a gas, or a mixture of states.

7 diatomic elements

Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine. (Have No Fear Of Ice Cold Beer.) (H2, N2..)

How do you find the neutrons when given the protons?

Mass number (at bottom) - Atomic number/Protons(or electrons) = neutrons

7 protons, 6 neutrons, 7 electrons

Nitrogen (N) because 7 protons aka atomic number 7