Who discovered the neutron?

Iron has 3 isotopes. 5.84% is Fe-54, 91.68% is Fe-56 and .31% is Fe-58. Without any calculations what is the approximate atomic mass of iron?

Discovered the charge and mass of the electron

Developed the plum pudding model of an atom

This element has 26 electrons, 29 neutrons, and 26 protons

From the choices below which step would occur first?

A hypothesis...

A controlled experiment allows the scientist to test

The vertical columns in the periodic table are known as...

Silicon is lustrous and is a conductor of heat and electricity, but is not malleable or ductile. For this reason, silicon is known to be a

The elements in Groups 1 and 2 are known respectively as

The order of elements in the periodic table is based on

Atoms of elements that are in the same group have the same number of

Which of the following elements is an alkali metal?

Carbon and other nonmetals are found in which area of the periodic table?

Magnesium is located to the right of sodium because Magnesium has

In Medeleev's periodic table, elements in each column had similar?

How was Mendeleev's periodic table arranged?

Mendeleev left gaps in his periodic table because

Each column of the periodic table is

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