Answers 25-26 KCS18 Chemistry ICElectrons and the Periodic Table

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How are isotopes defined?

forms of different elements that have the same number of neutrons in each atom

forms of different elements that have the same number of protons in each atom

forms of the same element that differ in the number of neutrons in each atom

forms of the same element that differ in the number of protons in each atom

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What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?

Rb > K > Na > Li

K > Rb > Na > Li

Li > Na > K > Rb

Rb > K > Li > Na

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

The modern model is not as widely accepted by scientists as Dalton’s model.

The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.

The modern model recognizes particles in the atom, whereas Dalton’s model does not.

The modern model does not explain emission spectra, whereas Dalton’s model does.

The symbol for xenon (Xe) would be a part of the noble gas notation for the element

antimony.

cesium.

radium.

uranium.

How many electrons can the n = 4 shell hold?

What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment?

The stream of cathode ray particles was moving very slowly.

The glass opposite of the negative electrode started to glow.

The electric voltage had little effect on the stream of particles.

The tube contained two pieces of metal that served as electrodes.

Which element has an ion that is smaller than an ion of calcium?

potassium

strontium

cesium

magnesium

Which shows the electron configuration for Silicon (Si)?

[Ar]4s23d104p4

[Ar]3d14s2

[Ne]3s23p4

[Ne]3s23p2

The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have?

What was Johann Dobereiner’s contribution to the development of the periodic table?

He arranged the elements according to increasing atomic mass.

He arranged the elements according to increasing atomic number.

He identified triads of elements that had similar properties.

He organized elements into four groups based on their properties.

Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?

light with a low enough intensity

light with a high enough frequency

light with a high enough intensity

light with a low enough frequency

Which is most likely true about electronegativity?

It tends to be the same across a period.

It tends to be the same down a group.

It tends to increase across a period.

It tends to increase down a group.

Which property would xenon most likely have?

It is stable.

It is a solid.

It is flammable.

It is silver in color.

Which best describes the trends in electronegativity on the periodic table?

Electronegativity increases up and to the right.

Electronegativity increases down and to the left.

Electronegativity decreases up and to the left.

Electronegativity decreases down and to the right.

An atom of an element is shown by the model.How is this model useful?

It shows how electrons are distributed in the shells of an iron atom.

It shows how electrons are distributed in the shells of a cobalt atom.

It shows how orbitals are distributed in the shells of an iron atom.

It shows how orbitals are distributed in the shells of a cobalt atom.

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