PS: Unit 2 Test

Which scientist arranged the elements on the periodic table based on atomic mass?

• Dmitri Mendeleev
• Henry Moseley
• JJ Thomson
• Ernest Rutherford
• Niels Bohr

Which scientist hypothesized that electrons travel in fixed orbits around the nucleus of the atom?

• Niels Bohr
• Henry Moseley
• JJ Thomson
• Ernest Rutherford
• Democritus

Which scientist arranged the elements on the periodic table based on atomic number?

• Henry Moseley
• JJ Thomson
• Ernest Rutherford
• Niels Bohr
• Democritus

Which scientist named the atom based on the Greek word meaning indivisible and was the first to name the atom?

• Democritus
• Henry Moseley
• JJ Thomson
• Ernest Rutherford
• Niels Bohr

Which scientist developed the Nuclear Model and the Gold Foil experiment allowed him to discover that the nucleus was the positively charged center of the atom surround by negatively charged electrons?

• Ernest Rutherford
• Henry Moseley
• JJ Thomson
• Niels Bohr
• Democritus

Tags

NGSS.HS-PS1-8

Atoms of elements in the same group of the periodic table share the same

• number of energy levels

• number of valence electrons

• atomic numbers

• atomic masses

Atoms of the same element that have different numbers of neutrons are called

• molecules

• ions

• protons

• isotopes

The total number of neutrons in the nucleus of any atom is equal to the

• mass number of the atom

• atomic number of the atom

• atomic number minus the mass number

• mass number minus the atomic number

An atom is electrically neutral because

• neutrons balance the protons and electrons

• nuclear forces stabilize the charges

• the number of protons and electrons are equal

• the number of protons and neutrons are equal

Which word(s) below is represented by the word “period” on the Periodic Table?

• Group

• Family

• Energy Level

• Valence electrons