7th grade elements, atoms, periodic table

a subatomic particle that has a positive charge and that is found in the nucleus of the atom

these are shiny, ductile, good conductors, and malleable

describes something that occurs or repeats at regular intervals

repeating chemical & physical properties of elements change periodically with the atomic #'s

a subatomic particle that has a negative charge

the mass of an atom expressed in atomic mass units

the sum of the numbers of protons and neutrons in the nucleus of an atom

an atom that has the same # of protons as the other atoms of the element but has more neutrons

a unit of mass that describes the mass of an atom or molecule

shiny, brittle, good conductor

a horizontal row of elements in the periodic table

Which of the following scientists discovered that atoms contain electrons

an atom's central region, which is made up of protons and neutrons

a subatomic particle that has no charge and that is found in the nucleus of an atom

a vertical column of elements in the periodic table, these elements share chemical properties

how many protons does an atom with an atomic number of 23 and a mass number of 51 have

the smallest particle into which an element can be divided and still be the same substance

a region around the nucleus of an atom which electrons are likely to be found

the discovery of which particle proved that the atom is not indivisible

the number of protons in the nucleus of an atom, is the same for all the atoms of an element

not malleable or ductile, not shiny, poor conductor