How do electrons move in Bohr's model of the atom?
In a circular orbit around the nucleus.
100
How many valence electrons does Boron have?
3
100
Which element has a larger atomic radius, magnesium or strontium?
Strontium
100
What is different about isotopes of the same element? What stays the same?
Number of neutrons differs. Number of protons and electrons are the same.
200
Which subatomic particles make up the nucleus?
Protons and Neutrons
200
How do electrons move in the quantum mechanical model of the atom?
Electrons move as waves.
200
Draw the electron dot structure for Gallium
Ga (3 dots around it)
200
What is the trend for electronegativity across a period and down a group?
Electronegativity increases across a period, and decreases down a group.
200
Define valence electron.
Valence electrons are the electrons in an atom's outermost orbitals.
300
Why are atoms of an element electrically neutral?
The positive charge of protons cancel with the negative charge of electrons
300
What is an atomic orbital?
A three dimensional region that describes the probable location of electrons in an atom. Where electrons live.
300
What is the Noble gas notation for Silver?
[Kr] 5s2 4d9
300
Why do elements in the same group have similar chemical properties?
They have the same number of valence electrons!!
300
What are the three rules to follow when constructing the electron configuration for an element?
Aufbau principle, Pauli Exclusion principle, Hund's Rule.
400
An element has an atomic number of 8 and a mass number of 16. How many neutrons does it have? How many electrons? And what is the identity of the element?
8 neutrons, 8 electrons, Oxygen
400
What do the letters s, p, d, and f describe about an atomic orbital?
Orbital shape
400
What is the complete electron configuration for Manganese?
1s2 2s2 2p6 3s2 3p6 4s2 3d5
400
Which element has a higher ionization energy, Arsenic or Bromine?
Bromine
400
Why does atomic radius decrease as you move from left to right across a period?
The charge of the nucleus increases, and pulls the outer electrons closer.
500
An element has two isotopes: One isotope has a mass of 10.012937 and a percent abundance 19.9%. The other isotope has a mass of 11.009305 and a percent abundance 80.1%. Calculate the atomic mass of this element, and identify the element.
10.811 amu. Boron.
500
How many electrons can a d sublevel have?
10
500
Draw the orbital diagram for Silicon
9 boxes, the last three have only two arrows, both up.
500
Why do the noble gases have no value for electronegativity?
They have a full valence shell, so they are stable and don't want any electrons.
500
Draw the orbital diagram for Copper.
15 boxes, the last 5 have 9 arrows, only 1 arrow in the last box.