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Page 1: ELECTRON ARRANGEMENTS AND THE BOHR-RUTHERFORD · PDF fileELECTRON ARRANGEMENTS AND THE BOHR-RUTHERFORD DIAGRAM (pg. 185) The Bohr-Rutherford diagram of the atom is a useful way of

ELECTRON ARRANGEMENTS AND THE BOHR-RUTHERFORD DIAGRAM (pg. 185)

The Bohr-Rutherford diagram of the atom is a useful way of representing the arrangement of

_____________________ around the ________________ for the first 20 elements. Each electron

________________ is shown as a ring around the nucleus. Evidence indicates that only a _________________

number of electrons can occupy each orbit. The first orbit can hold a maximum of ______ electrons. Elements

with _____________ numbers above 18 must have some electrons in the _____________ orbit. Because all

atoms are electrically ___________________, the total number of electrons in these orbits must match the

number of __________________ in the ______________.

An atom of lithium is sometimes represented as ______________. This means that this particular atom has a

mass of _____________. The mass number is the total number of _________________ and

_____________________. Lithium atoms always have _________ protons, so this atom must also have four

________________ in the nucleus. To balance the charge of the three ______________, three

___________________ must be orbiting the nucleus. The first orbit can hold up to ___________ electrons.

Since the third electron cannot fit in the first orbit, it has to go in a ___________________ orbit.

The second orbit can accommodate up to ________ electrons. So as you proceed from element to element,

the number of electrons in the second orbit ____________________ by one until there are ___________, the

maximum number. Fluorine has _____________ electrons in its second orbit and neon has ______________ in

its second orbit. The outermost electron of sodium is in the ______________ orbit. Notice that the

___________________, or row number of an element tells you how many electron ____________________

the atoms have.

DRAW BOHR-RUTHERFORD DIAGRAMS FOR THE FIRST 20 ELEMENTS (UP TO Ca, CONTINUE ON BACK)

H

He

Li

Be

B

C

N

O

3p+

4n0