Atoms, Elements, and Periodic Table Vocabulary Flashcards

Terms Definitions
Group IA
alkali metals
Mass of a proton/neutron
negatively charged particles; move around the outside of the nucleus
Symbol: Ne Atomic Number: 10
element that has characteristics of both metals and nonmetals
weak force
force responsible for radioactive decay
British physicist (born in New Zealand) who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937)
an uncharged particle located in the nucleus of an atom
This element does not match the properties of any other group so it stands alone. It is placed above group 1 but it is not part of that group. It is a very reactive, colorless, odorless gas at room temperature (1 outer level electron)
positive charge- found in center of atom (nucleus), atomic mass unit of 1, number of protons determines the element
matter with the same fixed composition and properties
are most elements on the periodic table a metal, non-metal, or metalliod?
Symbol: Ca Atomic Number: 20 Common Uses: life forms for bones and shells.
Dmitri Mendeleev
Russian scientist who discovered a logical pattern in the properties of the elements
a pure substance that can not be separated or broken down into simpler substances by physical or chemical means
neutral- no charge- found in center of atom
most easily oberved in the behavior of large objects
..., a material composed of two or more elements or compounds that are physically mixed together but not chemically combined
how many groups are there on the periodic table?
atomic mass
total number of protons and neutrons in an atom
elements in a periodic table row and which change properties in a predictable pattern
2, 8, 8
The amount of electrons in each shell
chemical symbol
usually consists of a one or two letter abbreviation of the element name
What is the atomic mass for oxygen?
15. 999 amu
a type of element that lack most of the properties of metals
No net electric charge
Since the positive charge of the proton and negative charge of the electron balance each other, the atom has a charge of
What are isotopes?
an atom with the same number of protons but a different number of neutrons
Number of Protons and Electrons
The properties of each atom and element is determined by
chemical symbol for the first five elements in order, separated by commas?
H, He, Li, Be, B
the nucleus is made up of
protons and neutrons in a ball like structure
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