Periodic Table and Atoms Crossword

the smallest particle of an element that retains its identity in a chemical reaction
a weighted average mass of the atoms in a naturally occurring sample of the element
defined as one twelfth of the mass of a carbon-12 atom
the number of protons in the nucleus of an atom of that element
a beam of electrons emitted from the cathode of a high-vacuum tube
element is composed of only one kind of atom, and a compound is composed of particles that are chemical combinations of different kinds of atoms
negatively charged subatomic particle
each vertical column of the periodic table
a radioactive form of an element
total number of protons and neutrons in an atom
subatomic particles with no charge but with a mass nearly equal to that of a proton
the tiny central core of an atom and is composed of protons and neutrons
each horizontal row of the periodic table
an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
positively charged subatomic particle
metals in Group 1A
metals in Group2A
negatively charged ion
one half of the distance between the nuclei of two atoms of the same element when the atoms are joined
positively charged ion
the ability of an atom of an element to attract electrons when the atom is in a compound
nonmetals of Group 7A
highest occupied s sublevel and a nearby f sublevel generally contain electrons
an atom or group of atoms that has a positive or negative charge
energy required to remove an electron from an atom
generally has properties that are similar to those of metals and nonmetals
good conductors of heat and electric current
elements in Group 8A
poor conductors of heat and electric current
when elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
portion of the periodic table containing Groups 1A through 7A
highest occupied s sublevel and a nearby d sublevel contain electrons