Sabena's Honors Chemistry Flashcards

Front 1

Atom

Back 1

The smallest unit of an element, cannot be broken down more

Hint 1

Ex. One atom of hydrogen

The element was broken down to its smallest concentration, the atom.

Front 2

Atomic Mass

Back 2

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Hint 2

Atomic mass of Helium: 4.003

The atomic mass is the number of protons and neutrons.

Front 3

Atomic Mass Unit

Back 3

a unit of mass used to express atomic and molecular weights

Hint 3

Ex. 12 amu

equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg.

Front 4

Atomic number

Back 4

the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

Hint 4

Ex. He's atomic number is 2

The higher the atomic number, the heavier the element.

Front 5

Atomic Symbol

Back 5

Notation for one of the chemical elements, with mass# and atomic #

Hint 5

Ex. 1.0079 H 1 is hydrogen

The atomic symbol for Zinc is 65.39 mass, atomic number 30? Zn.

Front 6

Chemical Symbol

Back 6

Notation for one of the chemical elements

Hint 6

ex. H is helium

The chemical symbol for zinc is Zn.

Front 7

Electron

Back 7

Negative elementary electric charge

Hint 7

If an atom loses an electron it becomes positive.

Front 8

Group

Back 8

Column of elements in the periodic table

Hint 8

Ex. Zn, Cd, Hg, Uub

Zn, Cd, Hg, Uub are all in the same group on the periodic table.

Front 9

Isotopes

Back 9

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Hint 9

Ex. C12 vs C13

One isotope of Carbon is radioactive.

Front 10

Mass number

Back 10

the total number of protons and neutrons in a nucleus.

Hint 10

Ex. C12

The atomic number of C is 12.

Front 11

Metal

Back 11

Definition of Metals. Elements that form cations when compounds of it are in solution and oxides of the elements form hydroxides rather than acids in water.

Hint 11

Ex. Iron

Iron, gold, and silver are metals.

Front 12

Metalloid

Back 12

an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.

Hint 12

Ex. Germanium

germanium is intermediate between those of metals and solid non metals.

Front 13

Neutron

Back 13

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Hint 13

Ex. In an atom

a neutron has about the same mass as a proton.

Front 14

nonmetal

Back 14

Any of a number of elements, such as oxygen or sulfur, that lack the physical and chemical properties of metals.

Hint 14

Ex. Oxygen

Sulfer is a nonmetal, iron is a metal.

Front 15

Nucleus

Back 15

Positively charged center of an atom containing protons and neutrons

Hint 15

The nucleus contains almost all the mass of the atom

Front 16

Period

Back 16

Horizontal rows on the periodic table

Hint 16

Ex: H, He

The periodic table has seven periods.

Front 17

Proton

Back 17

Particle found in the nucleus with a positive charge

Hint 17

Ex. He has 2 protons

The number of protons gives the

atomoc number.

Front 18

Subatomic particle

Back 18

Protons, neutrons, and electrons, smaller than the atom

Hint 18

Ex. Proton

Sub atomic particles make up the atom.