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Exam 12: Atoms and the Periodic Table

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Question 61

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Which of the following statements is false?

A) The atomic spectrum of helium is different from the atomic spectrum of neon.
B) Electromagnetic radiation often behaves like a wave.
C) An atomic spectrum is an element's fingerprint.
D) An atom emits electromagnetic radiation when an electron moves from a lower energy level to a higher energy level.
E) Light that is high in energy has a high frequency.

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Question 62

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If an element has 18 protons and 20 neutrons and 18 electrons, which expression correctly identifies the element?

A) argon-38
B) argon-18
C) argon-20
D) calcium-38
E) calcium-20

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Question 63

Multiple Choice

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Which of the following elements is a gas at room temperature?

If an element has 9 protons and 10 neutrons and 9 electrons, which expression correctly identifies the element?

What does the following element description actually mean? U

Since atoms are mostly empty space, why don't objects pass through one another?

Which of the following statements describes an isotope?

Which of the following is not the name of a chemical family?

The following statement describes which subatomic particle best? It does not have an electrical charge.

Which element has the atomic number 9?

Does a shell have to contain electrons in order to exist?

An electron de-excites from the fourth quantum level to the third and then directly to the first. Two frequencies of light are emitted. How do their combined energies compare to the energy of the single frequency that would be emitted by de-excitation from the fourth level directly to the first level?The combined energies of the two frequencies emitted by the one electrons is

Which are older, the atoms in the body of an elderly person or those in the body of a baby?

Strontium, Sr (number 38) , is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20) . This fact relates to the organization of the periodic table in that strontium and calcium are both

Which of the following elements are in the same group as silicon (Si) ?

How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values?

How might the spectrum of an atom appear if its electrons were not restricted to particular energy levels?

If a neutral element has the following chemical symbol, how many electrons does it have? O

The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6, calculate the atomic mass of lithium, Li (atomic number 3) .

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom? A B C D