Atoms
Proton +, Neutron 0, Electron -
A pure substance that consists on only one type of atom
What is element?
Substance formed by the chemical combination of two or more elements in definite proportions
What is a compound?
Forms when electrons are shared between atoms
What are covalent bonds?
An atom with a positive or negative charge
What is an ion?
The two subatomic particles that make make up the majority of the mass of an atom
What are protons and neutrons?
What are neutrons?
The chemical and physical properties of a compound is ___________ from those of the individual atoms.
What is different?
Forms when electrons are transferred between atoms.
Why is water considered a molecule, but NaCl is not?
Because water is a covalent compound.
The place where electrons are located
What is the energy shell (level)
Isotopes that have unstable nuclei
What are radioactive isotopes?
What is H2O
The charge of an atom that loses 2 electrons.
What is 2+?
What are van der Waals forces?
The two subatomic particles found in the nucleus of an atom
What are protons and neutrons
This is what causes isotopes of the same element to have the same chemical properties.
What is the same number of electrons?
The chemical formula for table salt.
What is NaCl?
The charge of an atom that gains 2 electrons
What is 2-?
The term used for the essential elements that make up 1% of the mass of an organism.
What is a trace element?
What is unable to cut?
What is the mass number?
What is the ratio of elements ?
Which are stronger, ionic or covalent bonds?
What are ionic bonds?
What 6 elements compose about 99% of the mass of an organism?
SPONCH