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Unit 2 Atomic History and Structure Flashcards | StudBud
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Unit 2 Atomic History and Structure
Unit 2 Atomic History and Structure
20 terms
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atoms, atomic time line, periodic table
Flashcards
20 cards
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Questions
20
Answers
1
Which of the following statements is true about this model of the atom?
The neutrons are smaller then the protons
It is compared to the solar system
It is the most modern model
Electrons were not yet discovered
2
Where can you find the number of protons for an element on the periodic table?
the atomic mass number
The group number
the period number
the atomic number
3
Why is the nucleus positively charged?
because of the protons
because of the quarks
because of the electrons
because of the neutrons
4
If an atom has 5 protons and an atomic mass of 10.811 how many neutrons does it have?
5 neutrons
16 neutrons
15 neutrons
6 neutrons
5
What is the atomic number of potassium?
39
39.098
19
20
6
Which was the first subatomic particle discovered by scientists?
Neutrons
Protons
Electrons
Quarks
7
Which particles make up the nucleus of the atom?
Proton and Neutron
Electron and Proton
Electron and Neutron
Quarks and Protons
8
Which parts of the atom have nearly the same mass?
neutron and proton
proton and electron
electron and neutron
proton and quark
9
Why is it so difficult to directly observe atoms?
all of the above
They are transparent
They are very small and very fast
We are not sure they are real
10
Which part of the atom was discovered with this model of the atom?
Nucleus
Electron Cloud Levels
Electron
Neutron
11
What is the chemical symbol of calcium?
20
Calcium
Ca
40
12
What did scientists compare to this model of the atom?
Plum Pudding
The Solar System
Clouds
Billard Balls
13
Why is an atom's overall charge neutral?
There is an equal number of electrons and neutrons.
The nucleus has only protons and neutrons.
There is an equal number of protons and neutrons.
There is an equal number of protons and electrons.
14
If two atoms have the same number of protons, what is true about those two atoms?
they are the exact same mass
they have a positive charge
they are the same element
they are an ion
15
Which part of an atom tells us the identity of the element?
size of nucleus
number of protons
number of electrons
number of shells
16
Which statement is true about electrons?
electrons are negative and found in the nucleus
electrons are positive and found in the nucleus
electrons are negative and found outside the nucleus
electrons are positive and found outside the nucleus
17
What are valence electrons?
smallest electrons
electrons closest to the nucleus
fastest electrons
outermost electrons in an atom
18
Which part of the atom has the least mass?
the protons
the neutrons
the electrons
the nucleus
19
What is the charge of an atom with 12 electrons and 12 protons?
negative
neutral
positive
static
20
On the periodic table which elements are most alike?
Elements in the same group
Elements that are metals
Elements that are non-metals
Elements in the same period
