Atoms and Elements

What is an atom?

An atom is the smallest unit of an element, consisting of a nucleus made of protons and neutrons, surrounded by electrons in shells.

What is a compound?

A compound is a substance formed when two or more different elements are chemically bonded together.

Relative charge of a proton?

A proton has a relative charge of +1.

Relative mass of a proton?

A proton has a relative mass of 1 atomic mass unit (amu).

Relative charge of a neutron?

A neutron has a relative charge of 0.

Relative mass of a neutron?

A neutron has a relative mass of 1 atomic mass unit (amu).

Relative charge of an electron?

An electron has a relative charge of -1.

Relative mass of an electron?

An electron has a relative mass of approximately 1/1836 amu.

Atomic structure of an element?

An element consists of atoms that have the same number of protons in their nuclei.

Diagram of a hydrogen atom?

A hydrogen atom consists of one proton in the nucleus and one electron orbiting around it in a circular path.

Diagram of an oxygen atom?

An oxygen atom consists of eight protons and neutrons in the nucleus, with six electrons in two energy levels.

Diagram of a water molecule (H₂O)?

A water molecule is composed of two hydrogen atoms covalently bonded to one oxygen atom.

Diagram of a hydrogen molecule (H₂)?

A hydrogen molecule consists of two hydrogen atoms covalently bonded together.

Diagram of a water atom?

A water atom is not a standard term; typically, you refer to water as a molecule (H₂O).

Diagram of an oxygen molecule (O₂)?

An oxygen molecule consists of two oxygen atoms bonded together.

Why do atoms have no overall charge?

Atoms have no overall charge because they contain an equal number of protons (positive charge) and electrons (negative charge).

Why does sugar dissolve quicker in hot water than in cold water?

Sugar dissolves quicker in hot water because the increased temperature provides more energy, allowing sugar molecules to break apart and interact with water molecules more easily.

Diagram of a simple compound?

A simple compound can be represented by a chemical formula, such as H₂O for water, showing the elements involved and their ratios.

Diagram of a mixture of two components?

A mixture of two components is represented as different particles of each component mixed together, without any specific ratio.

Diagram of a mixture containing an element and a compound?

This mixture can be shown with particles of an elemental substance (e.g., Cl) and a compound (e.g., NaCl) randomly distributed.

Diagram of a mixture of two compounds?

This mixture shows two different compounds (e.g., C₆H₁₂O₆ and NaCl) mixed together without any chemical bonding.

How can sugar dissolve more quickly in cold water?

Sugar can dissolve more quickly in cold water by stirring the water to increase interaction between the sugar and water molecules.