Exploring Physical Science Concepts

Front

What is the atomic number of Oxygen?

Back

8

Answer explanation

Oxygen has an atomic number of 8, which means it has 8 protons in its nucleus. This is a fundamental property of the element, distinguishing it from others on the periodic table.

Front

Which of the following is a chemical property of a substance?

Color

,

Density

,

Flammability

,

Mass

Back

Flammability

Answer explanation

Flammability is a chemical property because it describes how a substance reacts with fire. In contrast, color, density, and mass are physical properties that do not involve a change in the substance's chemical structure.

Front

Identify the number of protons, electrons, and neutrons in the isotope. Options:

Protons: 36, Electrons: 36, and Neutrons: 48

,

Protons: 36, Electrons 36 and Neutrons: 47

,

Protons: 36, Electrons: 47 and Neutrons 83

,

Protons: 36, Electrons 47 and Neutrons 36

Back

Protons: 36, Electrons: 36, and Neutrons: 48

Answer explanation

The correct choice is Protons: 36, Electrons: 36, and Neutrons: 48. In a neutral atom, the number of protons equals the number of electrons. The number of neutrons can be found by subtracting the atomic number from the mass number.

Front

Which subatomic particle is electrically neutral (no charge)?

Back

Neutron

Answer explanation

The neutron is the subatomic particle that is electrically neutral, meaning it has no charge. In contrast, protons are positively charged, electrons are negatively charged, and ions are charged atoms.

Front

Emma and William are studying chemistry. Pick the 2 statements THAT correctly describe A FLUORINE ATOM.

Options:

Fluorine atoms have 19 protons inside the nucleus 

,

Fluorine atoms have 19 neutrons inside the nucleus

,

Fluorine atoms have 19 particles inside the nucleus

,

Fluorine atoms have 10 neutrons inside the nucleus

,

  Fluorine atoms have 19 electrons outside the nucleus

Back

Fluorine atoms have 10 neutrons inside the nucleus

,

  Fluorine atoms have 19 electrons outside the nucleus

Answer explanation

Fluorine has 9 protons and 10 neutrons, totaling 19 particles in the nucleus. Therefore, the correct statements are that fluorine atoms have 19 particles inside the nucleus and 10 neutrons inside the nucleus.

Front

What's the atomic number of this element? Options: 20, 40, 1, 2

Back

20

Answer explanation

The atomic number of an element represents the number of protons in its nucleus. The correct answer is 20, which corresponds to the element Calcium (Ca) on the periodic table.

Front

What is the mass number of an isotope with 20 protons and 22 neutrons?

Back

42