Historical models of the atom
According to Rutherford's 1911 model, where is all the positive charge and mass of an atom located?
In the center of the atom, called the nucleus.
Do smaller or bigger atoms have greater elctronegativity?
Smaller
Significant digits in 34.50
4
the distance from the centre of an atom to the boundary within which the electrons spend 90 percent of their time.
Atomic radius
Water
H2O
Dalton's atomic model proposed that all matter is constructed from tiny, indestructible particles called _____.
Atoms
What group on the periodic table can we see the largest spike in an atomic radii graph
Alkali metals
Convert 109 g into kg
0.109
Rows on the periodic table. Each row has the same number of shells
Periods
Beryllium Oxide
BeO
Which subatomic particle did J.J. Thomson identify using cathode ray tubes?
Electrons
Why does ionization energy decrease as you move down a group?
Valence electrons are further from the nucleus and easier to remove.
How many significant digits are there in 0.0907?
3
an indicator of the relative ability of an atom to attract shared electrons.
Elctronegativity
MnS2
Manganese Sulfide
What did Ernest Rutherford conclude about the internal structure of an atom based on the fact that most alpha particles passed straight through gold foil?
The atom consists mostly of empty space.
Why does the atomic radius decrease as you move from left to right across a period in the periodic table?
The increasing effective nuclear charge pulls electrons closer to the nucleus.
What is 10 dekametres in millimetres?
100000
The apparent nuclear charge as experienced by the outermost electrons of an atom as a result of the shielding of the inner-shell electrons
Effective nuclear charge
Sodium Hydroxide
NaOH
In the Bohr model of the atom, what is released when an electron in an excited state falls back to a lower energy level?
A photon
Compared to the electromagnetic force repelling protons, how much stronger is the strong nuclear force that holds the nucleus together?
100 times
How many digits are to the right of the decimal point in 9.753 × 10⁻⁸?
11 (0.00000009753)
Happens when there is an imbalance between nuclear and electrostatic forces.
Radioisotopes
Pb3(PO4)2
Lead (III) Phosphate