Bechmark

Which scientist is credited with the discovery of the electron, leading to the development of the atomic model?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• James Chadwick

Tags

VA.PS.2.a

Explain how the periodic table is organized to help predict the chemical properties of elements.

• By atomic mass

• By atomic number and electron configuration

• By alphabetical order

• By color

Tags

VA.PS.2.b

Describe the main postulate of the kinetic molecular theory regarding the motion of particles in a gas.

• Particles are stationary

• Particles move in random, constant motion

• Particles move in a fixed pattern

• Particles do not interact with each other

Tags

VA.PS.2.c

How did the discovery of isotopes challenge the original concept of the atomic model?

• It showed that atoms are indivisible

• It demonstrated that atoms of the same element can have different masses

• It proved that electrons orbit in fixed paths

• It confirmed that atoms are mostly empty space

Tags

VA.PS.2.a

Which element is most likely to form a positive ion based on its position in the periodic table?

• Neon (Ne)

• Sodium (Na)

• Chlorine (Cl)

• Argon (Ar)

Tags

VA.PS.2.b

Predict what happens to the pressure of a gas if the temperature is increased while the volume remains constant.

• Pressure decreases

• Pressure remains the same

• Pressure increases

• Pressure fluctuates

Tags

VA.PS.2.c

What was the major contribution of Niels Bohr to the atomic theory?

• Discovery of the neutron

• Development of the planetary model of the atom

• Discovery of the electron

• Development of the quantum mechanical model

Tags

VA.PS.2.a

How can the periodic table be used to determine the reactivity of an element?

• By its color

• By its position in a group or period

• By its atomic mass

• By its density

Tags

VA.PS.2.b

Using the kinetic molecular theory, explain why gases are compressible while solids are not.

• Gas particles are far apart, while solid particles are closely packed

• Gas particles are stationary, while solid particles move freely

• Gas particles are larger than solid particles

• Gas particles are heavier than solid particles

Tags

VA.PS.2.c

Which of the following elements is a noble gas?

• Oxygen (O)

• Nitrogen (N)

• Helium (He)

• Hydrogen (H)

Tags

VA.PS.2.b