How do you find atomic mass?

The sum of protons and neutrons

What is atomic theory?

Everything is made up of tiny particles called atoms.

What is the first step in calculating the avg. atomic mass of isotopes?

change the percentages to decimals

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Atomic Structure Review

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Questions 20

Answers

1
What is an Orbital?
The energy level around the atom
The area where a Proton will probably show up
The area where a Electron will probably show up
a packet of energy
2
What are isotopes?
Atoms of the SAME element that have extra NEUTRONS
Atoms of the SAME element that have extra PROTONS
Electrons gained or lost that causes an atom to gain energy
Atoms of DIFFERENT elements that have extra ELECTRONS
3
The definition of frequency is...
How many waves!
How many waves per second
How many waves in a unit time
How short a wavelength is
4
Which of the orbital diagrams violates Hund's Rule?
B
none of the above
A
C
5
How do you find atomic mass?
The product neutrons and electrons
The sum protons and electrons
The product of protons and neutrons
The sum of protons and neutrons
6
What is the electron configuration of potassium?
1s22s22p63s23p63d1
[Ar]3d1
1s22s22p63s23p64s1
[Ar]4s1
7
Which of the orbital diagrams violates the Aufbau Principle?
none of the above
B
A
C
8
Strontium-90 has a mass number of?
38
52
27
90
9
What is atomic theory?
Most atoms are metals.
Everything is made up of tiny particles called atoms.
Atoms make up compounds.
Atoms can be rearranged to form new elements.
10
how do you calculate the number of neutrons in an atom?
neutrons - electrons
mass number - protons
protons - electrons
protons - neutrons
11
what is the electron configuration of Arsenic?
4s2 3d10 4p3
[Ne] 3s2 4p6
[Ar] 4s2 3d10 4p3
As
12
Which element has 16 protons and has the chemical symbol S?
Selenium
Scandium
Sulfur
Silicon
13
The unit for wavelength is measured in__________________.
Hertz
meters
feet
centimeters
14
What is the equation for calculating the energy of a wave?
c = f λ
E = h f
15
What is the energy of a photon that has a frequency of 4.48 E 14 Hz?
2.97 E -19 J
1.47 E -48 J
6.76 E 47 J
10.4 E -20 J
16
A photon has an energy of 2.93 E -25 J. What is its frequency?
6.88 E -9 Hz
2.26 E -9 Hz
1.94 E -58 J
4.42 E 8 Hz
17
The nucleus of an atom consists of ________________________.
protons and neutrons
protons and electrons
protons and orbitals
neutrons and electrons
18
What experiment did Rutherford use?
Copper experiment
Gold experiment
Gold foil experiment
Silver foil experiment
19
What is the first step in calculating the avg. atomic mass of isotopes?
add the masses together
multiply the masses by the abundance
change the percentages to decimals
multiply by 100
20
The atomic number of an atom is the number of
protons plus number of neutrons
protons
electrons
neutrons

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