Question 1

Which of the following statements best describes a chemical element?

Accepted Answer

A pure substance consisting of atoms with the same number of protons.

Question 2

What is the chemical symbol for sodium, and what is its origin?

Accepted Answer

Na, from the Latin name natrium.

Question 3

Which group on the periodic table is known as the alkali metals?

Accepted Answer

Group 1

Question 4

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 5

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms of different elements are different from each other.

Question 6

Which experiment led to the discovery of the atomic nucleus?

Accepted Answer

Rutherford’s gold foil experiment

Question 7

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus.

Question 8

An atom of carbon-14 has how many neutrons?

Accepted Answer

8

Question 9

Which of the following is true for isotopes of the same element?

Accepted Answer

They have the same number of protons.

Question 10

Given the atomic symbol $$\$$displaystyle ^{24}$$_{12}\mathrm{Mg}$$, how many protons, neutrons, and electrons does a neutral atom have?

Accepted Answer

12 protons, 12 neutrons, 12 electrons

Question 11

Which of the following best describes a period on the periodic table?

Accepted Answer

A horizontal row of elements.

Question 12

Which property is characteristic of metals?

Accepted Answer

Good conductors of heat and electricity.

Question 13

What is the mass number of an atom with 17 protons and 20 neutrons?

Accepted Answer

$$\displaystyle 37$$

Question 14

Which of the following elements is essential for health and found in hemoglobin?

Accepted Answer

Iron (Fe)

Question 15

If an atom is neutral, which statement must be true?

Accepted Answer

The number of protons equals the number of electrons.

Question 16

Which of the following is a correct example of a chemical symbol derived from a Latin name?

Accepted Answer

Pb for lead (plumbum)

Question 17

Which subatomic particle has a positive charge?

Accepted Answer

Proton

Question 18

A neutral atom of chlorine has 17 protons. How many electrons does it have?

Accepted Answer

17

Question 19

Which model of the atom described electrons embedded in a positively charged 'pudding'?

Accepted Answer

Thomson’s plum pudding model

Question 20

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have different numbers of neutrons.

Elements, The Periodic Table, and Atomic Structure: Week 2 Study Notes

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