4A
Who rejected the Greek concept of matter and published the Skeptical Chemyst? He also called for experimentation to be the basis of science.
Robert Boyle
Iodine is classified as a __________________.
Nonmetal
Electron dot notation uses dots to represent all ____________________.
Valence electrons
Draw the electron dot notation for Silicon.
Mrs. Bryan will check your answer.
Which scientist used X-ray spectroscopy to determine the atomic number for each element? His discovery led to an update of the periodic law which now states that the properties of elements vary in a periodic way with their atomic numbers.
Henry Moseley
Who concluded that fire could not be an element since it required oxygen to form it and made one of the first lists of elements?
Antoine Lavoisier
These elements are fairly conductive, increasingly so as temperature rises.
Metalloids
True or False: Elements with more protons and electrons almost always have smaller atomic radii than those with fewer protons and electrons.
False! As you increase in protons and electrons the # of energy levels also increases making the atomic radius larger.
Draw the electron dot notation for Boron.
Mrs. Bryan will check your answer.
Which element has a lower electronegativity? Beryllium or Calcium
Calcium
Who noticed elements in groups of 3 with similar properties and called them triads?
Johann Dobereiner
List 3 properties of metals that we discussed in class.
Dense, ductile, malleable, lustrous solid, highly conductive, very reactive especially with nonmetals.
The measure of an element's ability to attract and hold electrons when bonded to other atoms is called ________________________.
Electronegativity
On the basis of its position on the periodic table, what do we know about Argon?
Type of element, period #, # of energy levels, group #, # of valence electrons, group name, reactive or not and why?
It is a nonmetal. It is found on Period 3 so it has valence electrons on the 3rd energy level. Being in group 18, it has 8 valence electrons and is a noble gas. Because its outer energy level is full, it is chemically unreactive.
Would carbon or oxygen act more like a nonmetal?
Oxygen; it is father from the heavy stairstep line.
Who organized the elements by increasing atomic mass and left blank spaces for unknown elements that he predicted would be found in the future?
Dmitri Mendeleev
Each family contains elements whose properties are _______________.
Similar
How many valence electrons do Gallium, Phosphorus, and Tin have?
Gallium: 3, Phosphorus: 5, Tin: 4
Is Xenon or Rubidium more reactive?
Rubidium because it is an alkali metal and they are very reactive by nature. Xenon has all 8 electrons so it is not chemically reactive.
Draw the electron dot notation for Barium.
Mrs. Bryan will check your answer.
Who developed the Law of Octaves and the earliest form of the Periodic Law?
John Newlands
Groups 13-16 are called the "mixed groups" because...
They have metals, nonmetals, and metalloids.
How does the atomic radius change from RIGHT to LEFT across the periodic table?
How does the electronegativity change from TOP to BOTTOM along the periodic table?
It increases.
It decreases.
Which element has the largest atomic radii? Potassium, Bromine, Cesium, Astatine
Cesium
How does the periodic table model the designed structure of atoms?
The rows represent the energy levels. The placement of the elements in columns is related to the arrangement of the electrons in the atoms.