Properties of Elements
Name two physical properties of matter.
density, boiling point, texture, ...
The mass and charge for 1 proton, 1 neutron, and 1 electron
1 amu (+), 1 amu (0), 1/2000-negligible (-).
The most reactive group of metals is...
alkali metals
The definition of electronegativity
The measure of the ability of an atom in a chemical compound to attract electrons.
The conversion factor between atoms and moles and the scientist it was named for
6.022 x 10^23 atoms/mol
Avogadro
How did Mendeleev organize the original periodic table?
by atomic mass
The number of protons, neutrons, and electrons in a neutral oxygen atom with a mass of 18.
8, 10, 8
What are two properties of noble gasses
colorless, odorless, NONREACTIVE
The measurement of what is required to remove an electron
ionization energy
The mass of 4.50 mol of potassium atoms (potassium atomic mass of 39.0983 amu)
176 g
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 (or lanthanides and actinides), to Save space
The element with the LOWEST electronegativity
Francium
the number of atoms are in 6.33 moles of Cu
3.81 x 10^24 atoms
What do these two elements have in common? boron and tellurium
metalloids, similar properties.
The model of a Nitrogen -14 Atoms
Must have 7 p, 7 n, and 7 e in 2 energy levels (2,5)
Why is hydrogen placed by itself on the periodic table?
has very different properties, unique properties
Which metal would have the lowest ionization energy
Fr
How many atoms are in 58.7 g of Br?
4.42 x 10^23 at
Two elements that would have similar properties to Sulfur
2 of: Oxygen, Selenium, Tellurium, Polonium.
A model of 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 two electrons in order to achieve noble gas status.
Group 6A elements (O, S, Se, Te, Po)
The relationship ionization energy, electronegativity and atomic radius (all three)
IE and E are the same trend, and AR is backwards.
The mass of 1 atom of Be
1.497 x 10 ^ -23 grams