The Structure of the Atom Chemistry Test

Created by angstein94 

Upgrade to
remove ads

77 terms · This is on the structure of the Atom

False

T or F? Ancient philosophers regularly performed controlled experiments

True

T or F? Philosophers formulated explanations about the nature of matter based on their own experiences

True

T or F? Both Demcritus and Dalton suggested that matter is made up of atoms

True

T or F? Dalton's atomic theory stated that atoms separate, combine, or rearrange in chemical reactions

False

T or F? Dalton's atomic theory stated that matter is mostly empty space

False

T or F? Dalton was correct in thinking that atoms could not be divided into smaller particles

True

T or F? Dalton's atomic theory stated that atoms of different elements combine in simple whole-number ratios to form coumpounds.

True

T or F? Dalton thought that all atoms of a specific element have the same mass.

False

T or F? Democritus proposed that atoms are held together by chemical bonds, but no one believed him.

True

T or F? Dalton's atomic theory was based on careful measurements and extensive research.

Rutherford

Who proposed the nuclear atomic model?

Thomson

Who determined the mass-to-charge ratio of an electron?

Millikan

Who calculated the mass of an electron?

Plum pudding model

In this model, the atom is composed of electrons (which Thomson still called "corpuscles," though G.J. Stoney had proposed that atoms of electricity be called electrons in 1894), surrounded by a soup of positive charge to balance the electron's negative charge, like plums surrounded by pudding.

Nuclear atomic model

A theory of atomic structure in which nearly all the mass is concentrated in a small nucleus, electrons surrounding the nucleus fill nearly all the atom's volume, the number of these electrons equals the atomic number, and the positive charge on the nucleus is equal in magnitude to the negative charge of the electrons

Proton (P) location

nucleus

Neutron (N) location

nucleus

Electron (e-) location

space around the nucleus

+1

What is the relative charge of a Proton?

1

What is the relative mass of a Proton?

0

What is the relative charge of a Neutron?

1

What is the relative mass of a Neuton?

-1

What is the relative charge of an Electron?

1/1840

What is the relative mass of an Electron?

False

T or F? The number of neutrons in an atom is referred to as its atomic number

True

T or F? The periodic table is arranged by increasing atomic number.

True

T or F? Atomic number is equal to the number of electrons in an atom.

True

T or F? The number of protons in an atom identifies it as an atom of a particular element.

False

T or F? Most atoms have either a positive or a negative charge.

82 protons, 82 electrons

Lead has an atomic # of 82. How many protons and electrons does lead have?

8

Oxygen has 8 electrons. How many protons does oxygen have?

30

Zinc has 30 protons. What is its atomic number?

85

Astatine has 85 protons. What is its atomic number?

104 protons, 104 electrons

Rutherfordium has an atomic # of 104. How many protons and electrons does it have?

84 protons, 84 electrons

Polonium has an atomic # of 84. How many protons and electrons does it have?

102 protons, 102 electrons

Nobelium has an atoic # of 102. How many protons and electrons does it have?

19 protons, 19 electrons, 20 neutrons

# of P, E, & N's- An isotope has atomic # 19 and mass number 39.

14 protons, 14 neutrons

# of P, E, & N's- An isotope has 14 electrons and a mass # of 28

19 protons, 19 electrons

# of P, E, & N's- An isotope has 21 neutrons and a mass # of 40

51 protons, 51 electrons, 72 neutrons

# of P, E, & N's- An isotope has an atomic # 51 and a mass # 123

smaller than the mass of a proton and a neutron, and a tiny fraction of the mass of an atom

The mass of an electron is....

1/12 the mass of a carbon-12 atom

One atomic mass unit is

both the relative abundance and the mass of each of the atom's isotopes

The atomic mass of an atom is usually not a whole # because it accounts for

indirectly

Everything we know at the atomic level has been measured ___________

460-370 BC

time period of Democritus

1803

time period of John Dalton

1897

time period of J.J. Thomson

1909

time period of Ernest Rutherford

1913

time period of Niels bohr

Democritus

Who 1st proposed that matter was made up of tiny particles called atoms?

Democritus

Who stated atoms could not be created, destroyed, or further divided?

Dalton

Who proposed the Atomic Theory in 1803?

Dalton

Who took half a century until he was well accepted?

Dalton

It took 100 years until __________ was prove

J.J. Thomson

Who discovered electrons in 1897?

electrons

Chemistry is driven by ___________

J.J Thomson

Who made the Plum Pudding Model?

+

Pudding's Charge

-

Plum's Charge

Rutherford

Gold foil experiment 1909-mass concentrated in very small core at the atom's center (nucleus)

Bohr

Doctoral Thesis 1911- Theory of Electrons

James Chadwick

Who identified the neutron?

Nucleus, and the Electron Cloud

What are the 2 main parts of an atom?

protons (+) and neutrons (0)

Nucleus contains:

amu's

Mass of an atom is measured in _________

positive

Protons and neutrons are found in the nucleaus, so it has a ______ charge

negative

Electrons are found in the electron cloud, so it has a _____________ charge

amu

1 _______ is defined as 1/12 teh mass of a carbon atom containing 6 protons and 6 neutrons

amu

1________ is also the mass of 1 proton or 1 neutron

1/2000

An electron has a mass of __________ amu

Atomic Number

the number of protons in the nucleus of an atom

Mass Number

the sum of the # of protons and the # of neutrons in the nucleus

Mass#=

#protons + # neutrons

Isotopes

atoms of the same element with differing #'s of neutrons

masses

isotopes have different ____________

average atomic mass

the average mass of the mixtures of its isotopes

mass

Isotopes containing more neutrons have a greater __________

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set