Atomic Structure Test Review

What does the number 84 in the name Krypton-84 represent?

• protons and electrons

• atomic number

• mass number

• electrons and neutrons

What is the charge of an Iron (Fe) ion with 24 electrons?

• +2

• -2

• -24

• +24

Gold atoms can be identified based on the number of which subatomic particles?

• protons

• neutrons

• electrons

• nuclei

The nucleus of an atom is

• composed of protons and neutrons

• negatively charged with a low density

• positively charged with only protons and electrons

• negatively charged with a high density

Tags

NGSS.HS-PS1-8

An element has the atomic number of 76. What are the protons and electrons in a neutral atom?

• 76 protons and 76 electrons

• 76 protons and 152 electrons

• 76 electrons and 152 protons

• 76 protons and 0 electrons

Which subatomic particle is negatively charged?

• electron

• proton

• neutron

• all the particles are negatively charged

The Greek philosopher Democritus gave us what word for a tiny piece of matter that cannot be divided?

• atom

• element

• electron

• molecule

Which of the following part of Dalton's atomic theory are no longer true?

• all atoms of the the given element are identical

• atoms are indivisible in chemical reactions

• elements are made of tiny particles called atoms

• atoms are not created or destroyed in chemical reactions

Tags

NGSS.HS-PS1-7

An ion with 12 protons and 10 electrons is which element

• Mg +2

• Ne +2

• Mg -2

• Ne -2

Tags

NGSS.HS-PS1-1

According to Dalton's theory, when elements combine to form a compound

• Simple whole number ratios

• By offset masses by a factor of 6

• All the masses are the same

• By fractions of atoms to make the ratios 1:1