Unit 2 Chem

The dot notation for lead, Pb, has

1 pair of electrons and 2 single electrons

The maximum number of electrons in the third energy level is

18

An electron cannot have the quantum numbers n = ____, l = ___, ml = ____

2,2,-1

An alpha particle has an atomic number of ____ and a mass number of ___

2,4

There are ____ neutrons, _____ electrons, and _____ protons in 4820Ca

28,18,20

The lines in the emission spectrum of hydrogen result from

Energy given off in the form of visible light when an electron moves from a higher energy state to a lower energy state.

The gold foil experiment performed in Rutherford's lab ____

Lead to the discovery of the atomic nucleus

Atomic radius generally decreases as we move ________.

Up a group and from left to right across a period

Which particle below would have the largest radius

X^-3

The four quantum numbers are analogous to the _______________ of an electron

address

Elements in the modern version of the periodic table are arranged in order of increasing ______

atomic number

Which element in period 3 has the highest electronegativity

chlorine

The first ionization energies of the elements ___ as you go from right to left across a period of the periodic table, and ___ as you go from the top to the bottom of a group in the table.

decrease, decrease

The energy of a photon of light is ____ proportional to its wavelength and ____ proportional to its frequency

inversely, directly

Electronegativity decreases when ___ and increases when ____

move down, move left to right

Of the following transitions in the Bohr hydrogen atom, the ____ transition results in the emission of the lowest energy photon

n=4 to n=3

Of the following transitions in the Bohr hydrogen atom, the ____ transition results in the emission violet light with a wavelength of 4.10 x 10-7m

n=6 to n=2

If n is the principal quantum number for an energy level, then the total number of orbitals in that energy level is

n^2

The valence electron configuration of the alkaline earth metals is _____

ns^2

All atoms of a given element have the same ____.

number of protons

What color of visible light has the lowest energy

red

What element has the ground state electron configuration of [18Ar]4s23d104p4

selenium

The most reactive nonmetals are found at the _____ of the periodic table.

top right

Elements in the d-block of the periodic table are called

transition metals