How many electrons does the pictured krypton atom contain?

• 84
• 36
• 48
• 120

Tags

NGSS.HS-PS1-1

Which of the following best describes the Bohr model atom?

• It shows that electrons are evenly scattered in the atom
• Electrons are in the nucleus of an atom
• Electrons are in orbits around the nucleus
• It showed that electrons can be found anywhere in the atom

How many electrons on in this atom of nitrogen?

• 15
• 7
• 3
• 10

Tags

NGSS.HS-PS1-1

What does the number after Carbon-12 represent?

• the atomic mass
• the ion charge
• the number of neutrons
• the number of protons

Which of the following is NOT true about JJ Thomson's idea of the atom?

• He discovered the electron

• He developed the plum pudding model of the atom

• He used a cathode ray

• He discovered the charge and mass of an electrons

What element is this?

• Sodium
• Magnesium
• Carbon
• Oxygen

Tags

NGSS.HS-PS1-1

An atom has 16 protons and 18 electrons.  What is the charge on the atom?

• 0 (neutral)
• +2
• -2
• -18

Who said a sample of a given compound, no matter the size, has the same proportions?

• Dalton
• Millikan
• Rutherford
• Boyle

An atom has 17 protons, 18 electrons, and 18 neutrons.  What is the charge of this atom?

• 0 (neutral)
• +1
• -1
• +18

Which model of the atom is being shown in the diagram? (Hint: look at the labels)

• Dalton's Model
• The Plum Pudding Model
• Bohr's Model
• Schrodinger's Model