Question 1

Which of the following elements is a metalloid?

Accepted Answer

silicon

Question 2

Which of the following is NOT a characteristic property of Group 1A (alkali metal) elements?

Accepted Answer

Most of them are liquids at room temperature.

Question 3

The atomic number of an atom is equal to the number of ______.

Accepted Answer

protons

Question 4

Which of the following elements is a noble gas?

Accepted Answer

helium

Question 5

The number of neutrons in an atom is equal to ______.

Accepted Answer

the mass number minus the atomic number

Question 6

What is the mass number of an atom of potassium that has 20 neutrons?

Accepted Answer

39

Question 7

Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is ______.

Accepted Answer

64

Question 8

Consider a neutral atom with 30 protons and 34 neutrons. The number of electrons in this atom is ______.

Accepted Answer

30

Question 9

How many protons are in an isotope of sodium with a mass number of 25?

Accepted Answer

11

Question 10

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes are atoms of the same element that have different numbers of neutrons.

Question 11

Which of the following elements is a metal?

Accepted Answer

strontium

Question 12

Which of the following is the correct symbol for copper?

Accepted Answer

Cu

Question 13

Which of the following is the correct symbol for sulfur?

Accepted Answer

S

Question 14

Which of the following is the correct symbol for silver?

Accepted Answer

Ag

Question 15

A neutral atom of $$^{50}_{118}Sn$$ has how many protons, neutrons, and electrons?

Accepted Answer

50 protons, 68 neutrons, 50 electrons

Question 16

Which of the following is NOT true about the Group 8A (18) elements?

Accepted Answer

They are good conductors of electricity.

Question 17

In an atom, the nucleus contains ______.

Accepted Answer

all the protons and neutrons

Question 18

Which of the following elements are found in hydroxyapatite, $$Ca_5$$($$PO_4)_3OH$, a major compound in human bones and teeth?

Accepted Answer

calcium, phosphorus, oxygen, hydrogen

Question 19

The mass number of an atom can be calculated from ______.

Accepted Answer

the number of protons plus neutrons

Question 20

Which of the following best describes the relationship between atomic number and chemical properties?

Accepted Answer

Elements with the same atomic number have the same chemical properties.

Question 21

Which of the following statements about electrons in a neutral atom is correct?

Accepted Answer

The number of electrons equals the number of protons.

Chaap 4

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