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Atoms and Periodic Table

Across
General area around the nucleus where electrons are located is called the electron ______.
The ______ energy level can hold a max of 18 electrons
Particles located outside the nucleus of an atom with a negative electric charge.
Particles located in the nucleus of an atom with a neutral electric charge.
The Alkaline Earth metals are shiny, ductile and __________; combine readily with other elements
Have both metallic and non-metallic properties
A short way to write the name of an element is the chemical _______.
These elements are vital to sustain life.
Good conductors of heat and electricity, all but mercury are solid at room temperature.
Smaller particles that make up protons and neutrons.
Horizontal rows of elements that contain increasing numbers of protons and electrons
The ______ energy level can hold a max of 32 electrons
Down
The amount of protons and electrons in an atom is the atomic _______.
The first energy level can only hold a max of ___ electrons
The originator of the periodic table is Dmitri ________. It was organized the original periodic table by atomic mass
Particles located in the nucleus of an atom with a positive electric charge.
The ______ gases are inert because outer energy level is complete
Vertical columns of elements with similar properties
Henry G. J. ______ proposed the modern periodic table be organized by increasing atomic number.
The sum of the protons and neutrons in the nucleus of an atom is the atomic ____.
The second energy level can hold a max of ______ electrons
The periodic table displays elements and is organized by increasing atomic _______.
The most reactive of all metals are the ________ metals. These don't occur in nature in their element form.
The electron ____ diagram uses the element symbol and dots to represent outer energy level electrons.