Atoms and Periodic Table

A horizontal row of elements in the periodic table is called

• period

• group

• atomic number

A vertical column of elements in the periodic tables is called a

• period

• group

• atomic number

Elements in the same __________________________ often have similar chemical and physical properties.

• period

• group

The electrons in the outer most energy level are called ________________________ electrons.

• protins

• neurtons

• valence

The region in the atom that contains most of the mass is called _____________________.

• protons

• neutrons

• electrons

• nucleus

The number of protons in an atom determines its

• atomic number

• atomic mass

• protons

• neutrons

Who was the scientist that proposed and named the smallest particle?

• Dalton

• Bohr

• Rutherford

• Democritus

John Dalton was known for

• Theory of all elements are composed of atoms

• Plum Pudding Model

• Gold Foil Experiment

• Electrons traveled around the nucleus

Tags

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Who discovered the “plum pudding model”?

• Dalton

• Thomson

• Bohr

• Rutherford

What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?

• They each identified new elements

• They each identified new isotopes of atoms

• They each contributed to the development of the atomic theory

• They each conducted experiments in which particles collided

Tags

NGSS.MS-PS1-5