2024 SGO Review English

The modern periodic table is arranged in order of increasing atomic ____.

• mass

• charge

• number

• radius

The atomic number of an element is the total number of which particles in the nucleus?

• neutrons

• protons

• electrons

• neutrons and electrons

In a neutral atom, the number of protons and __________ must be equal.

• neutrons

• mass number

• electrons

• nucleus

Which subatomic particle is located outside of the nucleus?

• Protons

• Neutrons

• Electrons

All atoms of the same element must have the same number of _____.

• protons

• neutrons

• electrons

• energy levels

Which of the following is true about subatomic particles?

• Electrons are negatively charged and have a mass of 1 amu.

• The mass of a neutron equals the mass of a proton.

• Neutrons have no charge and have no mass.

• Protons are positively charged and have no mass.

The sum of the protons and neutrons in an atom equals the ____.

• atomic number

• nucleus number

• electron number

• mass number

Atoms of the same element that each have a different atomic mass is called a(n) ____.

• ion

• nucleus

• isotope

• compound

The number 12 in the name carbon-12 represents the __________.

• atomic number

• mass number

• sum of protons and electrons

• none of the above

If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?

• 1 and 2

• 3 and 4

• 1 and 4

• 2 and 3