Scientists started to notice repeating patterns when they arranged the elements in order by increasing atomic mass. This repeated pattern is called _______.

In 1869, Russian chemist Dmitri Mendeleev organized the elements in a table much like our ______ periodic table.

The most striking features of Mendeleev’s periodic table were the _______ spaces that he left between some elements.

The spaces left blank in Mendeleev’s periodic table were for _______ elements that he predicted would be found in the future.

The discoveries of gallium (31) and germanium (32) proved that Mendeleev was _________.

The arrangement of the _________ table relates to the structure of the atoms themselves.

English ________ Henry Moseley made an important discovery in 1914.

Moseley recognized that he was able to use a new technique called X-ray ________ to determine the atomic number for each element.

A family, or group, is a set of elements in the same _______ on the periodic table.

The most updated versions of the periodic table include all the elements through ______ number 118.

Most importantly, each element in the group has the same number of ______ electrons, which are the electrons in the outermost energy level of a neutral atom.

Scientists call a row on the periodic table a ______.

Each period represents an _______ level.

The row that a certain element is ______ in also designates the energy level of its valence electrons.

In ________, an atom could have an infinite number of energy levels, but so far we know only of elements with up to seven energy levels.

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