Question 1

Dalton's atomic theory proposed that atoms of different elements combine to form compounds. Which modern chemical principle directly supports this proposal?

Accepted Answer

The law of definite proportions

Question 2

Which of the following statements about subatomic particles is correct according to the Thomson model?

Accepted Answer

Electrons are the simplest negative particles in an atom.

Question 3

A neutral atom of iron-56 has 26 protons. How many neutrons does it have?

Accepted Answer

30

Question 4

Which isotope notation represents an atom with 11 protons, 12 neutrons, and 11 electrons?

Accepted Answer

$$\mathrm{^{23}_{11}Na}$$

Question 5

Element W has two isotopes: W-10 ($$10.013$$ amu, $$19.66\%$$ abundance) and W-11 ($$11.009$$ amu, $$80.34\%$$ abundance). Calculate the atomic mass of W.

Accepted Answer

$$10.51$$ amu

Question 6

Which of the following colors of visible light has the highest frequency?

Accepted Answer

Violet

Question 7

Which of the following types of electromagnetic radiation has the shortest wavelength?

Accepted Answer

X rays

Question 8

Which of the following wavelengths of light has the highest energy?

Accepted Answer

$$440 nm$$

Question 9

Which of the following is evidence for quantized energy changes in atoms?

Accepted Answer

Line spectrum

Question 10

Copper occurs naturally as $$^{63}Cu $$and $$^{65}Cu. $$Which isotope is more abundant?

Accepted Answer

$$^{63}Cu$$

Question 11

Which of the following colors of light has the longest wavelength?

Accepted Answer

Red

Question 12

Which of the following represents the quantum nature of light?

Accepted Answer

Photon

Question 13

Which of the following wavelengths is in the visible region of the electromagnetic spectrum?

Accepted Answer

$$550 nm$$

Question 14

Why are atomic masses expressed on a relative atomic mass scale?

Accepted Answer

Atoms are too small to weigh directly.

Question 15

Element X has two isotopes: X-6 ($$6.015$$ amu, $$7.5\%$$ abundance) and X-7 ($$7.016$$ amu, $$92.5\%$$ abundance). Calculate the atomic mass of X.

Accepted Answer

$$6.94$$ amu

Question 16

Which of the following subatomic particles is found outside the nucleus?

Accepted Answer

Electron

Question 17

Which of the following colors of light has the lowest energy?

Accepted Answer

Red

Question 18

Which of the following is an example of a quantized change in energy?

Accepted Answer

A ball rolling down a flight of stairs

Question 19

Which isotope of lithium is more abundant in nature?

Accepted Answer

Lithium-7

Question 20

Which of the following types of radiation has the highest energy?

Accepted Answer

X rays

Intro to Chemistry: Atomic Structure, Isotopes, and Light – Guided Study

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