Science Flashcard

Front

What is the nucleus of an atom?

Back

The nucleus is the small, dense center of an atom that contains protons and neutrons.

Front

What particles make up the nucleus of an atom?

Back

The nucleus is made up of protons, which have a positive charge, and neutrons, which have no charge.

Front

Why do protons and neutrons have more mass than electrons?

Back

Protons and neutrons are much larger and heavier than electrons, which are very light.

Front

What is the most common element in living organisms?

Back

Oxygen is the most common element found in living organisms.

Front

What is the composition of Earth's atmosphere?

Back

Earth's atmosphere is primarily composed of nitrogen, oxygen, carbon dioxide, and other gases.

Front

Which gas is most abundant in the atmosphere?

Back

Nitrogen is the most abundant gas in Earth's atmosphere.

Front

What does the periodic table represent?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

Which element is the most reactive among sodium, aluminum, argon, and sulfur?

Back

Sodium (Na) is the most reactive element among these.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How do you determine the number of protons in an element?

Back

The number of protons in an element is equal to its atomic number on the periodic table.