History
Which two scientist organized their elements by increasing atomic mass
Newlands
Mendeleev
How many groups are on the periodic table? How many period are on the periodic table?
There are 18 groups and 7 period on the periodic table
Define a group. Define a period
A group is a vertical column of elements on the periodic table
A period is a horizontal row of elements on the periodic table
What is the atomic number of the seventh element in the 5th period?
Atomic number 41
Newland and Mendeleev both organized the periodic table by increasing atomic mass. How is Mendeleev's periodic table STRUCTURALLY different from Newland's
Mendeleev created a new row when he saw a repeat of characteristics, which lead to the creation of columns where elements also share characteristics
An element's period corresponds to its ___________________________
Highest filled ENERGY LEVEL (n)
John Newland makes an observation about the characteristics of elements after he arranged them by increasing atomic mass. What law is observed?
Law of octaves says that characteristics repeat every 8 elements
How many protons does the group 13 element in the 4th period have?
Gallium has 31 protons
What is Henry Mosley's contribution to the periodic table of today?
He reviewed x ray spectra to state that elements should be organized by atomic NUMBER and not atomic mass
Elements in the same GROUP share what characteristic ?
Orbital shape
Define a valence electron
A valence electron is an electron found on the outer ring of an elements Bohr's model
How many valence electrons do the elements in group 14 have?
DAILY DOUBLE:
Draw and identify the three parts of Bohr's model
(you either get this completely right or not)
Nucleus, orbitals, electrons
Which element has a higher energy level n, Platinum or Palladium. Must explain your reasoning to receive points
Palladium has a higher energy level because it ends in a higher period than Platinum. Energy level increases as elements move down the periodic table
State the periodic law
When elements are arranged by increasing atomic number, properties are repeated at regular intervals
Write the final orbital for the element in group 2 period 6
6s2
What do the gaps in Mendeleev's periodic table indicate?
They indicate that there are unknown elements with certain characterisitcs
What groups are contained in each block
S:
P:
D:
S: GROUPS 1 &2
D: GROUPS 3-12
P: GROUPS 13-18
The atomic mass of an atom is EQUAL TO SUM of what particles
Protons + Neutrons
What is the mass of a silicon atom with 14 protons, 14 electrons and 13 neutrons? Explain how you got that
14 Protons + 13 Neutrons = mass of silicon
27 amu = mass of silicon
FOCUS ON WHAT THE QUESTION TELLS YOU YOU HAVE