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.