Why do we use models of atoms?

actual atoms are too small to see

a combination of two or more atoms

In what way(s) is this drawing of an atom inaccurate?

It show the electrons in orbit around the nucleus

What is the name of the table that contains all of the different types of atoms?

The periodic table of the elements

In what way(s) is this drawing of an atom accurate?

it show the correct parts (protons, neutrons, electrons)

a particle found in the nucleus

a neutral particle found in the nucleus

Why has the Atomic Theory changed over time?

new technologies have allowed the discovery of new info.

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Atoms and Molecules for 7th Grade Science

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Atoms and molecules basics

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Questions 19

Answers

1
How many protons are in the element Nitrogen?
21
7
14.007
14
2
What makes up the nucleus of an atom?
electrons and neutrons
electrons and protons
electrons, protons, and neutrons
protons and neutrons
3
Why do we use models of atoms?
models are fun to play with
actual atoms are too small to see
models are less expensive than real atoms
models are perfect representations of atoms
4
What is an atom?
something made of molecules
something that contains tritons and neutrons
a bomb
The smallest unit of matter
5
If the nucleus was the size of a marble, how far away would the electron cloud be?
a football field away
20 kilometers
a lightyear away
20 astronomical units away
6
What is a molecule?
a combination of two or more atoms
a moles cuticle
part of an electron
a part of an atom
7
In what way(s) is this drawing of an atom inaccurate?
It shows the electrons outside of the nucleus
It show the electrons in orbit around the nucleus
It shows the charge of the particles
It shows the protons and neutrons in nucleus
8
What was Democritus describing with the word atomos?
a cell
a mineral
a virus
an atom
9
Which of the following is smaller than an atom?
a molecule
an electron
a piece of aluminum foil
a grain of sand
10
What is the name of the table that contains all of the different types of atoms?
The table of molecules
The periodic table of molecules
The table of chemicals
The periodic table of the elements
11
Which is larger than an atom?
a neutron
a molecule
a nucleus
a proton
12
Which of the pictures represents an atom?
Picture C
Picture B
Picture A
Picture D
13
In what way(s) is this drawing of an atom accurate?
it shows how big the nucleus is
it shows how far away the electrons are from the nucleus
it show the correct parts (protons, neutrons, electrons)
it shows moving electrons
14
The atomic number equals the number of
protons and neutrons
neutrons
atomic mass
protons
15
Which picture contains the most atoms?
Picture B
Picture C
Picture D
Picture A
16
What is a proton?
a particle found in the nucleus
part of an electron
the part of the atom that rests
a negatively charged particle found outside of the nucleus
17
Which picture does not represent a molecule?
Picture C
Picture B
Picture D
Picture A
18
What is a neutron?
a part of an electron
a negatively charged particle found in the nucleus
a neutral particle found in the nucleus
a neutral molecule
19
Why has the Atomic Theory changed over time?
new technologies have allowed the discovery of new info.
old theories become less popular
scientists vote on new theories
atomic structure has changed over time

Atoms and Molecules for 7th Grade Science Flashcards | StudBud