Flashcards
Chapter 5
Flashcards do conjunto (25)
- 1proton-positive
-found in the nucleus - 2electron-negative
-found orbiting around the nucleus - 3neutron-no charge
-found in the nucleus - 4nucluesa mass of protons and neutrons
- 5atomsAn atom is the basic unit of an element. An atom is a form of matter which may not be further broken down using any chemical means.
- 6atomic numbernumber of protons and electrons
- 7atomic massmass of an element
- 8subatomic particlesprotons, nuetrons and electrons
- 9periodic tablea table of the chemical elements arranged in order of atomic number
- 10valence electronelectrons found in the outermost orbit
- 11isotopeeach of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
- 12groupis a column of elements in the periodic table
- 13periodis a row across in the periodic table
- 14metal-shiny
-conducts heat and electricity well
-malleable
-ductile - 15non-metal-dull
-does not conduct heat and electricity - 16metalloid-has some properties of metals and some properties of non-metals
- 17John Daltondiscovered atomic theory
- 18J.J Thomsondiscovered the rasin bun model
- 19Ernest Rutherforddiscovered the "nuclear model" through his gold foil experiment
early planetary model - 20Neils Bohrdiscovered more modern planetary model of the atom
used flame tests to study atoms - 21Alkali Metals-extremely reactive
-group 1
-malleable, ductile - 22Alkaline earth Metals-reactive
-group 2
-malleable, ductile - 23Halogens-very reactive
-group 17 - 24Noble Gases-do not react
-stable
-group 18 - 25only 2 elements that are liquidmercury and bromine
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- Grade 9 Science FlashCards sobre Chapter 5, criado por nat obrien em 24-10-2016.
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- nat obrien
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