Periodic Trends — Unit test

Question 1

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

Revolt · Accepted Answer

boiling

Question 2

Which element is the most reactive?

Revolt · Accepted Answer

sodium

Question 3

Which element has 32 protons in its nucleus?

Revolt · Accepted Answer

germanium

Question 4

Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?

Revolt · Accepted Answer

Kr

Question 5

In which orbitals would the valence electrons for selenium (Se) be placed?

Revolt · Accepted Answer

s orbital and p orbital

Question 6

When electrons are removed from the outermost shell of a calcium atom, the atom becomes

Revolt · Accepted Answer

a cation that has a smaller radius than the atom.

Question 7

The diagram below shows some subatomic particles.Which of these statements best identifies the particle that is labeled with an X?

Revolt · Accepted Answer

It is either a proton or a neutron.

Question 8

Which pure substance can be classified as an element?

Revolt · Accepted Answer

H2

Question 9

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of neutronsNumber of electrons198929983991049109Based on the table, which atom has a charge of –1?

Revolt · Accepted Answer

3

Question 10

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

Revolt · Accepted Answer

They both have the same atomic number.

Periodic Trends — Unit test Answers

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