What did Rutherford prove about the atom?

The atom is mostly empty space with a dense, positive core.

What is the current theory of electrons, and what is their role in the atom?

Quantum Theory; they determine chemical reactivity.

Why can we not determine the exact location of electrons?

Electrons are too small and move too quickly.

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Atomic Structure and Electron Configuration Review

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A review of atomic theory, atomic structure, and electron configuration.

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Questions 13

Answers

1
How many protons, neutrons, and electrons in ¹²⁸I^-?
53 p+, 75 n0, 54 e-
53 p+, 54 n0, 75 e-
53 p+, 52 n0, 75 e-
53 p+, 75 n0, 52 e-
2
Calculate the atomic mass of Du, which has 3 isotopes: ²⁹Du (5%), ³⁰Du (25%), and ³¹Du (70%).
29.40
31.25
30.00
30.65
3
What is the electron configuration of Br^-?
1s22s22p63s23p64s23d104p4
1s22s22p63s23p64s23d104p6
1s22s22p63s23p64s24p65s25p6
1s22s22p63s23p64s23d104p5
4
What is the electron configuration of oxygen atoms?
1s22s23s24s2
1s22s22p33s1
1s22s22p4
1s22s22p6
5
How is mass number calculated?
Protons + Neutrons
Protons + Electrons
Protons - Electrons
Protons - Neutrons
6
How many electrons are in Ge^2+?
34
32
2
30
7
What did Rutherford prove about the atom?
The atom is mostly empty space with a dense, positive core.
The atom is the smallest particle possible.
The atom has small negative particles embedded in it.
Electrons orbit the nucleus with specific energies.
8
How do negative ions form?
An atom gains an electron.
An atom loses a proton.
An atom loses an electron.
An atom gains a proton.
9
How many unpaired electrons are there in an oxygen atom?
4
1
2
3
10
Calculate the atomic mass of Bc, if it has 2 isotopes: ⁴²Bc (40%) and ⁴⁴Bc (60%).
43.0
43.5
43.2
42.8
11
What is the current theory of electrons, and what is their role in the atom?
Bohr Theory; they determine chemical reactivity.
Quantum Theory; they determine chemical reactivity.
Bohr Theory, they determine the identity of the element.
Quantum Theory; they determine the identity of the element.
12
Why can we not determine the exact location of electrons?
The electron cloud is too large.
They are trapped in the nucleus.
Electrons are too small and move too quickly.
The neutrons get in the way.
13
Why are neutrons needed for all atoms (besides Hydrogen) to exist?
They create all of the mass of the atom.
They neutralize the atom.
They balance out the electrons.
The stabilize the nucleus.

Atomic Structure and Electron Configuration Review Flashcards | StudBud