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- 13 subatomic particles that make up an atomProtons, neutrons, and electrons
- 2Nucleonsprotons and neutrons found in the nucleus of the atom
- 3Relative charge of a proton, neutron, and electronProton= +1
Neutron= 0
Electron= -1 - 4Relative mass of a proton, neutron, and electronProton= 1
Neutron= 1
Electron= 1/1840 - 5Explain why we assume there is the same number of protons and electrons in an atomAn atom is neutral. Therefore there must be equal numbers of protons and neutrons, because their charge is equal in size but opposite in sign.
- 6The force that holds protons and neutrons together in the nucleusNuclear force
- 7The attraction that holds together electrons and protons together in an atomElectrostatic force
- 8Explain why the protons within the nucleus do no repel each otherThe nuclear force is much stronger that the electrostatic force.
- 9The atomic structure of an atomConsists of a tiny nucleus made up of protons and neutrons, that is surrounded by electrons
- 10Atomic/ proton numberThe number of protons in the nucleus
The atomic number defines the chemical identity of an element - 11The number of electrons in the outer shell of an atom determines......the chemical properties of an element ( how it reacts) and what sort of element it is.
- 12All atoms of the same element have the same _____________Atomic number
- 13Mass numberThe total number of protons and neutrons in the nucleus ( the total number of nucleons)
- 14IsotopesAtoms with the same number of protons but different numbers of neutrons.
- 15Explain why different isotopes of the same element react chemically in exactly the same wayThis is because, they have the same electron configuration
- 16Explain why atoms of different isotopes of the same element vary in mass numberThis is because, they have a different number of neutrons in their nuclei.
- 17Explain why electrons fill up from the shell closest to the nucleus fistElectrons fill lowest energy shells first
- 18The formula to calculate the number of electrons that each shell can hold (n= shell number)2n*2
- 19—
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- FlashCards sobre Sem título, criado por tanya-williams46 em 10-08-2015.
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