SCIENCE REVIEWER

On the basis of Rutherford's model of an atom, which subatomic particles is/are present in the nucleus?

• neutron and electron

• proton and electron

• proton and neutron

• proton only

Tags

NGSS.HS-PS1-8

Who proposed that the electron (which is thought as a particle) could also be thought of as a wave?

• Erwin Schrodinger

• Neils Bohr

• Louie de Broglie

• Werner Karl Heisenberg

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NGSS.HS-PS4-3

The fixed energies that the electrons have are called __________.

• atomic orbitals

• orbits

• energy levels

• electronic configuration

Tags

NGSS.HS-PS1-1

Atom is defined as the ultimate indivisible particle of matter. Which of the following is NOT true about the sub-atomic particles of atom?

• the proton has positive charge

• the electron is negatively charged particles

• the electron and proton are found inside the nucleus

• the nucleus is the central part

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NGSS.MS-PS1-1

The region of space around the nucleus where the electron is most likely to be found is called

• atomic orbitals

• electronic configuration

• energy levels

• orbits

Why do atoms react with one another to form chemical bonds?

• to produce ions

• to attain stability

• to form compounds

• to produce molecules

Tags

NGSS.HS-PS1-1

What type of bond is formed when there is attraction between the freely moving valence electrons and a

positively charged metal atom?

• ionic bond

• metallic bond

• polar covalent bond

• nonpolar covalent bond

Why can metals be drawn into fine wires like copper in our electrical wires?

• They are ductile.

• They are malleable.

• They have relatively high melting points.

• They are good conductor of heat and electricity.

Which of the following hydrocarbons has a triple bond in the molecule?

• butane

• ethene

• heptane

• propyne

Which of the following is NOT an example of ionic compound?

• sodium chloride

• calcium bromide

• magnesium oxide

• water