Biology / Molecular Basis of Life

Compound

A chemical substance composed of atoms of 2 or more distinct element chemically bonded to 1 another.

Neutron

A subatomic particle that has no charge and that is found in the nucleus of an

Proton

A subatomic particle, fundamental to all matter, existing in the nucleus, with a positive charge & about equal mass to a neutron.

Molecule

A unit of matter representing the chemical properties of a substance composed of 2 or more atoms held together by chemical bonds.

matter

Anything which occupies space & has mass.

diatomic

Containing 2 atoms.

Electron

Exists in energy levels around the nucleus of an atom & carries a negative charge

Nucleus

The positively charged center of an atom which contains both the protons & neutrons of the atom.

Which statement is correct?

electrons of a neutral atom always equals the number of protons.

atom

smallest unit of an element that still retains the chemical properties of the element.

There are___ elements that can be found to occur in nature.

92

Mixture

2 or more substances that are mixed together but not chemically combined

In nature, on Earth, matter can exist in _____phases.

3

atomic mass

The mass of an element

atomic number

The number of proton in the nucleus of the atom(Note: the number also equals the number of electrons around the nucleus).

Each element consists of only 1 type of atom. T/F

True

The subatomic particles/units which govern potential chemical reaction among elements are:

electron[s]

The common subatomic particles that make up an atom consist of protons, neutrons, and

electrons

What has mass & occupies space.

matter

Select 4 of the most abundant elements found in plants & animals.

nitrogen hydrogen carbon oxygen

In any particular element can always be identified by its:

number of protons

Each unique element is determined by the number of___occuring in the atom.

protons

Check the correct statements regarding a compound and a molecule:

📍A compound consists of 2 or more distinct bonded atoms. 📍A molecule may consist of 2 similar elements chemically bonded. 📍A molecule is the smallest chemical subunit of a compound.