Chapter 4 Atomic Structure
neutral, with protons equaling electrons
All atoms are ___________.
number of protons
All atoms of the same element have the same
electrons surround the nucleus & take up most of the volume
As a consequence of the discovery of the nucleus, which model of the atom is thought to be true
Isotope
Atom with same number of protons but different number of neutrons
B. Atoms of the same element are always identical
Dalton's atomic theory included which idea? A. all atoms of all elements are the same size B. Atoms of the same element are always identical C. Individual atoms can be seen with a microscope D. atoms of different elements always combine in 1-to-1 ratios
76 protons and 76 electrons
Element has an atomic number of 76. The number of protons and electrons in a neutral atom are
subtract the number of protons from the mass number
How is the number of neutrons in the nucleus of an atom calculated?
P 50 E 50 N 75
How many protons, electrons, & neutrons does an atom w/ atomic number 50 and a mass number 125
Number of Neutrons
Isotopes of the same element have different
weighted average of the masses of isotopes of the element
The atomic mass of an element is the
Protons
The atomic number of an element is the total number of which particles in the nucleus?
Nucleus
The central part of an atom
the mass number
What does the number 84 in the name krypton-84 represent?
Atomic Mass Unit
one-twelfth the mass of a carbon-12 atom
Amu
subtract the number of protons from the mass number
Atomic Number
the total number of protons and neutrons in the nucleus of an atom
Mass Number
the total number of protons and neutrons in the nucleus of an atom
Atomic
the weighted average of the mass of the isotopes of an element
mass and relative abundance of each isotope of that element
weighted average of the masses of isotopes of the element
the total number of protons and neutrons in the nucleus
The mass number of an element is equal to
Atom
The smallest particle of an element that retains the properties of that element is a(n) ______.
Atomic Mass
The sum of the protons and neutrons in an atom equals the _______
C. one-twelfth the mass of one carbon-12 atom
Which of the following is equals to one atomic mass unit? A.the mass of one electron B.the mass of one helium-4 atom C.one-twelfth the mass of one carbon-12 atom D.the mass of one carbon-12 atom
the mass of a neutron nearly equals the mass of a proton
Which of the following is true about subatomic particles?
C. atoms retain their identity in a chemical reaction
Which of the following was NOT among Democritus's ideas? A. matter consists of tiny particles called atoms B. atoms are indivisible C. atoms retain their identity in a chemical reaction D. atoms are indestructible
Millikan
Who conducted experiments to determine the quantity of charge carried by an electron?
democritus
Who was the man who was among the first to suggest the idea of the atom?
Charge to mass ratio of electrons was the same for every gas
Why did J. J. Thomson reason that electrons must be a part of the atoms of ALL elements?
Electron
a negatively charged subatomic particle`
Proton
a positively charged subatomic particle
Neutron
a subatomic particle with no charge
Atom
the smallest particle of an element that retains the properties of that element