Periodic Trends
Which element has the greater atomic size: Se or O?
Se
The atomic number of an element tells me the number of this in the nucleus
Protons
What type of element is malleable?
Metal
The element with 47 protons
Silver
The only Noble Gas that does not have 8 valence electrons.
Helium
Describe the trend of atomic size down a group and across a period?
Atomic Radius increases down a group and decreases across a period
Number of groups in the periodic table
8 or 18?
The element with four energy levels and two valence electrons.
Calcium
Developed the Law of Octaves, which explains that if elements were arranged according to increasing atomic mass similar properties would repeat every eight element.
John Newlands
Which element is more electronegative: Mg or Ne?
Mg
The horizontal rows on the Periodic table.
Periods
Material that can be hammered or rolled into sheets
Malleable
The Metalloid in period 4 with four valence electrons.
Germanium
Are found on the outermost energy level of an atom and determines how reactive an atom is.
valence electrons
List the following elements in order of decreasing atomic size: S, Cl and Na.
Na, Al S and Cl
Developed the Periodic Law, which explains that chemical and physical properties of elements recur periodically when elements are arranged in the order of their atomic weights.
Dmitri Mendeleev
The elements that touch the zigzag line on the Periodic Table.
Metalloid
The element with 50 protons
Tin
Mg and Ca belong to this group in the periodic table
group 2
Arrange the following elements in order of increasing ionization energy: Be, Mg and Sr.
Sr, Mg and Be
When added together they make up the atomic mass of an element.
Protons and neutrons?
What type of element is frequently used in computer chips?
Metalloid
Identify a nonmetal with only one valence electron.
Hydrogen
What type of element is frequently used in computer chips?
metalloid