Groups / Periods
How many electron shells do elements in period 4 have?
4 shells
How many protons in an element of Ca?
Ca (calcium) = 20 protons
Atomic numbers B + Ca - Li + Ar - H =?
5(boron) + 20(calcium) - 3(lithium) + 18(argon) - 1(hydrogen) = 39
What subatomic particles make up the nucleus of an atom?
Protons and Neutrons
As you move from left to right across the periodic table the electronegativity does what?
(increases or decreases)
Increases
What group are the Alkaline Earth Metals
Group 2
How many electrons is an element of Cu?
Cu (copper) = 29 electrons
Valance Electrons Xe - V - Cr + Be + K - F + Al = ?
8(Xe) - 2(V) - 1(Cr) + 2(Be) + 1(K) - 7(F) + 3(Al) = 4
What is the charge of the following subatomic particles? (protons, neutrons, electrons)
Protons: +
Neutrons: 0
Electrons: -
As you move from the top down to the bottom of the periodic table the electronegativity does what?
(increases or decreases)
Decreases
What group are the Halogens?
Group 17
How many neutrons are in an element of C?
(show your work)
C (carbon) = 6 neutrons
atomic mass - # of protons = # of neutrons
12 - 6 = 6
protons (Fe) + neutrons (Ag) + electrons (O) = ?
26 (Fe/iron) + 60 (Au/silver) + 8 (O/oxygen)= 94
What is the mass of the following subatomic particles? (protons, neutrons, electrons)
Protons: 1amu
Neutrons: 1amu
Electrons: 0amu
K (potassium) = 0.8
Na (sodium) = 0.9 (winner)
What group are the Alkali metals?
Group 1
What is the atomic mass of an element of Au?
Au (gold) atomic mass = 196.967aum
*Atomic Numbers*
Group8/Period4 + Group16/Period3 + Group1/Period7 =?
26(Fe) + 16(S) + 87(Fr) = 129
What do you call the outermost shell of electrons?
What element has the highest electronegativity?
Bonus:
What is its value (decimal)
Fluorine (F)
4.0
What group are the noble gases?
Group 18
What is the only metal element that is liquid at room temperature?
Hg (mercury)
12(Mg) + 14(N) - 7(I) * 10(Ne) / 4(Rb) = 8.5
Where are electrons found within an atom?
orbitals OR shells OR principle energy levels
What is electronegativity?
Measurement of how strongly an element can attract electrons