Question 1

Which subatomic particle is responsible for the positive charge of an atom, and where is it located?

Accepted Answer

Proton; located in the nucleus

Question 2

If an atom has 8 protons, 8 neutrons, and 8 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 8, Mass number: 16

Question 3

Atoms interact by means of their electrons to produce larger, more complex structures. Which part of the atom is directly involved in chemical bonding?

Accepted Answer

Electrons in the electron cloud

Question 4

Which of the following best describes an element?

Accepted Answer

A substance composed only of atoms with the same atomic number

Question 5

The mass of an atom is mainly determined by which subatomic particles?

Accepted Answer

Protons and neutrons

Question 6

Which statement about electrons is correct?

Accepted Answer

Electrons have a negative charge and are much smaller than protons or neutrons

Question 7

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

Accepted Answer

Na; from the Latin word 'natrium'

Question 8

Which of the following is true regarding the electron cloud?

Accepted Answer

It is created by the whirl of electrons around the nucleus

Question 9

A hydrogen atom contains one proton and one electron. What is its atomic number and why?

Accepted Answer

Atomic number is 1 because it has one proton

Question 10

Which of the following best explains why atoms are electrically neutral?

Accepted Answer

They have equal numbers of protons and electrons

Question 11

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 17, Mass number: 35

Question 12

Which of the following is the smallest stable unit of matter?

Accepted Answer

Atom

Question 13

What determines the chemical properties of an element?

Accepted Answer

The number of electrons in the outermost shell

Question 14

Which of the following is true about the nucleus of an atom?

Accepted Answer

It contains protons and may contain neutrons

Question 15

Which of the following statements about elements is correct?

Accepted Answer

Elements are defined by the number of protons in their atoms

Chemical Level of Organization: Atoms, Molecules, and Compounds

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