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what are the other names for atomic mass
- atomic weight, # of protons+neutrons.
electrons are ____ smaller than protons.
1/1837 of a proton or H.
Dalton's model of the atom
- 1) elements are composed of minute, indivisible particles called atoms.
- 2) atoms of the same element are alike in mass and size.
- 3) atoms of different elements have masses and sizes.
What part of Dalton's model had to be modified:
- the neutron # of an isotope increases mass. They had to modify the statement:
- atoms of the same element are alike in mass and size.
Who discovered ion
Who discovered the electron and structure of the atom
J.J. Thomson discovered the electron is in the sphere with the neutrons and protons packed in the center.
Who discovered neutrons
Explain isotopic notation in where these are located:
- Mass number (top left)
- Atomic number (bottom left)
- Symbol (right)
- Atom Charge (top right)
How to you calculate the mass number?
Protons+neutrons= atomic number.
how many electrons does an atoms have (Al+3) if it give it's 2 electrons?
10 electrons, because Aluminum has 13 proton=13 electrons.
How many electrons does Cl^-1 have if it has the mass #37?
18 electrons, because Cl has 17 protons, 17 electrons. a -1 charge indicates 1 more electrons.
Cl^+2 has ___ electrons
15 electrons, because it has 17 in a neutral atom. It lost 2 electrons to get a + charge.
what is the shape volume and how compact are the particles in a solid
- shape: definite
- Volume: definite
- particles: compact
what is the shape volume and how compact are the particles in a liquid
- shape: indefinite
- volume: definite
- particles: slightly compact
what is the shape volume and how compact are the particles in a gas
- shape: indefinite
- volume: indefinite
- particles: highly compressible/spaced
charge and group A1
Alkali metals +1
group 2: name & charge
Alkali earth metals, +2 charge
group 3-12: name & charge
transition metals & variable charge
group 13: name & charge
Metalloid (B), and non-metal, +3 charge
group 14: name & charge
metalloid (Si, Ge), and non-metals variable charge
group 15: name & charge
non-metal and metalloid (Sb), -3 charge.
group 16: name & charge
non-metals and metalloid (Te), -2 charge
Group 17: name & charge
Halogen, -1 charge
Group 18: name & charge
noble gas, 0 charge.