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The smallest unit of matter that retains the properties of an element is called __________.
an atom
Protons and neutrons are found in the __________ of an atom.
nucleus
The number of protons in an atom determines its __________.
atomic number
When an atom gains or loses electrons, it becomes an __________.
ion
The outermost shell of an atom is known as the __________ shell.
valence
A __________ is formed when elements combine in exact ratios to create a stable compound.
chemical compound
Acids release __________ ions when dissolved in water.
H+ (hydrogen)
The __________ scale measures the acidity or alkalinity of a solution.
pH
Electric current is the flow of __________ through a conductor.
electric charge
In a __________ circuit, components are connected side by side, allowing current to flow through multiple paths.
parallel
The force experienced by an object is the product of its mass and __________.
acceleration
In respiration, glucose combines with oxygen to produce carbon dioxide and __________.
water
DNA holds the genetic instructions needed for an organism's __________.
development
The process by which oxygen enters our blood is known as __________ exchange.
gas
The __________ system includes the heart and blood vessels responsible for circulating blood throughout the body.
circulatory
Chromosomes are made from coiled up __________.
DNA
A __________ is an organism's observable traits, influenced by its genotype.
phenotype
Nuclear reproduction that produces two identical daughter cells is known as __________.
mitosis
In a chemical equation, reactants are found on the __________ side.
left
Salts are formed during __________ reactions between acids and bases.
neutralization
