Scientists, the periodic table and the atomic theory

What property did Mendeleev use to arrange the elements in a table?

• alphabetical

• density

• melting point

• atomic mass

This model was developed after J.J. Thomson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Solar System Model" of the atom

Ernest Rutherford discovered that atoms were mostly _________________.

• negatively charged

• positively charged

• electrons

• empty space

Which scientist is credited for creating the "solar system" model of the atom?

• Schrodinger

• Rutherford

• Thompson

• Bohr

Who discovered the neutron?

• Chadwick

• Rutherford

• Boseman

• Bohr

People have always agreed that matter is made of atoms.

• True
• False

Tags

NGSS.MS-PS1-1

Order the atomic models below from the oldest to the most recent.

• 2, 1, 3, and 4

• 1, 2, 4, and 3

• 3, 2, 4, and 1

• 3, 1, 2, and 4

Whose model of an atom is displayed in the picture?

• Thomson
• Rutherford
• Dalton
• Bohr

Whose model of an atom is displayed in the picture?

• Rutherford
• Dalton
• Thomson
• Bohr

In the modern periodic table elements are arranged by:

• atomic mass

• atomic number

• valence electrons

• number of isotopes