Atomic Models

He found that electrons have specific amounts of energy and move in specific orbits around the nucleus, like planets orbiting the sun. 

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James Chadwick

He found the positively charged protons in the nucleus and said that electrons moved around the nucleus

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James Chadwick

An atom is electrically neutral because

• the numbers of protons and neutrons are equal.

• the numbers of protons and electrons are equal.

• neutrons balance the protons and electrons.

Tags

NGSS.HS-PS1-7

Who is the person credited with the formation of the "plum pudding" model?

• Thomson

• Rutherford

• Bohr

• Dalton

Which of the following statements are true about the electron cloud?

• It is neutrally charged

• It is negatively charged

• It is almost empty space

• It contains most of the mass of the atom

The smallest unit of an element that maintains the properties of that element

• proton

• atomic mass unit

• electron

• atom

Found that atoms are tiny, hard, and uncuttable.

• Schrodinger

• Rutherford

• Democritus

• Thomson

Which element has an atomic number of 6?

• Carbon
• Nitrogen
• Xenon
• Sodium

Tags

NGSS.HS-PS1-1

Fluorine has an atomic number of 9. How many protons does it have?

• 4
• 9
• 12
• 0

Which is a definition of an element? 

• The simplest form of matter, made up of many atoms.
• The simplest form of matter. Each element is made up of one type of atom.
• Two or more atoms chemically bonded to one another.
• Water, Earth, Fire, or Air