A&P Seeley 2.1
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Anything that occupies space and has mass.
The amount of matter in an object.
The gravitational force acting on an object of a given mass.
The international unit for mass.
1/1000 the mass of a kilogram.
The simplest type of matter with unique chemical properties.
- The smallest particle of an element that has the chemical characteristics of that element.
- All atoms of an element are the same.
The characteristics of matter result from what?
The structure, organization, and behavior of atoms.
What are atoms composed of?
Subatomic particles, some of which have an electric charge.
What are the three major types of subatomic particle?
- Neutron (not electric charge)
- Proton (one positive charge)
- Electron (one negative charge
What type of charge does a neutron have?
What type of charge does a proton have?
What type of charge does an electron have?
Atoms are electrically _____.
Why are atoms electrically neutral?
Each atom has an equal number of proton and electron and they cancel each other out.
What forms the nucleus of an atom?
Protons and neutrons
What moves around the nucleus of an atom?
- Surrounds the nucleus.
- Contains electrons.
- The number of protons in each atom.
- Therefore, also the number of electrons.
Each element is uniquely defined by what?
- The number of protons.
- (only hydrogen has 1, only carbon has 6, etc)
How many naturally occurring elements are there?
How are synthesized elements created?
By altering atomic nuclei.
- Two or more forms of the same element.
- Have the same number of protons but different neutrons.
Isotopes have the same _____ number but different ______ number.
How are isotopes denoted?
- The element symbol preceded by the mass number
- (1H – Hydrogen, 2H – Deuterium, 3H - Tritium)
The average mass of an elements naturally occurring isotopes.
The number of atoms in exactly 12 g of 12C (6.022 x 1023)
Contains Avogadro’s number of entities, such as atoms, ions, or molecules.
The mass of one mole of the substance expressed in grams.
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