Answers FPS Conceptual Science B - CRAtomic Numbers and Electron Configurations

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How many electrons can the n = 4 shell hold?

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Which of these properties is the best one to use for identification of an element?

the number of neutrons in the atomic nucleus

the number of protons in the atomic nucleus

the number of isotopes that are formed by the element

the number of charges on ions of the element

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 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?

Which is a set of valid quantum numbers?

n = 4, l = 4, m = 4

n = 1, l = –2, m = 0

n = –1, l = 0, m = 0

n = 4, l = 3, m = 3

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

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.

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to write out?

a set of quantum numbers for the last electron in the atom

a configuration with numbers, letters, and superscripts

a dot structure of the atom

an orbital notation of the atom

Which element would most likely have chemical properties similar to that of magnesium (Mg)?

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

The table below gives the data that is needed to calculate the average atomic mass of element B.IsotopeAtomic mass (amu)Relative abundance (%)B-1010.0119.91B-1111.0180.09Based on these data, what is the average atomic mass of element B?

10.01

10.51

10.81

11.01

Which property would xenon most likely have?

It is stable.

It is a solid.

It is flammable.

It is silver in color.

Which physical method can separate a mixture of steel ball bearings and marbles?

boiling

evaporation

filtration

sorting

What is the electron configuration of chlorine (Cl)?

1s22s22p63s23p3

1s22s22p63s23p5

1s22s22p63s24s23p3

1s22s22p63s23p23d3

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