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