Properties of Elements
Name two physical properties of matter.
density, boiling point, texture, ...
Give the mass and (charge) for 1 proton, 1 neutron, and 1 electron
1 amu (+), 1 amu (0), 1/2000-negligible (-).
(Electron's mass is too small to affect atomic mass.)
The most reactive group of metals is...
alkalis
The measure of the ability of an atom in a chemical compound to attract electrons.
electronegativity
List three properties common to metals.
conductive, shiny, malleable, ductile, higher melting points
How did Mendeleev organize the original periodic table? How do we organize it now?
Mendeleev -by atomic mass
Now - by atomic number (number of protons)
Indicate the number of protons, neutrons, and electrons in a neutral nitrogen atom with a mass of 14.
7, 7, 7
What is a property of noble gasses
colorless, odorless, NONREACTIVE!
What is the energy required to remove an electron?
ionization energy
List three properties common to nonmetals.
Brittle, nonconductive, dull, low melting points
indicate the difference between a group and a period on the periodic table.
group-up and down....period- left-right.
Argon-40 has how many protons, neutrons, and electrons?
What is 18, 22,18
What are the elements below the periodic table referred to as? why are they placed there?
Rare Earth Elements, to Save space
Which metal has the LOWEST electronegativity
Francium
What properties does silicon share with metals?
conductive, shiny
What do these two elements have in common? boron and tellurium
metalloids, similar properties.
Draw an aluminum-27 Atom (27Al)
Your drawing needs 13 p+, 14 n, and 13 e- on three energy levels
Why is hydrogen placed by itself on the periodic table?
has very different properties!
Which element would have the lowest ionization energy
Fr
Name three transition metals.
Any 3 transition metals
Name an element that would have similar properties to Sulfur
Oxygen, Selenium, Tellurium, Polonium.
Draw an oxygen-16 atom with a 2- charge.
8 protons, 8 neutrons, 10 electrons
2 rings
8 valence electrons
Pick an element that would have to gain an electron in order to match the electrons of a noble gas.
Halogens
F, Cl, Br, I, or At
How are ionization energy, electronegativity and atomic radius all related?
IE and E are the same trend, and AR is backwards.
Name three alkali metals.
List 3 of
Li, Na, K, Rb, Cs, Fr