Chemistry

Isotopes of the same element have different A. number of neutrons B. number of protons C. numbers of electrons D. atomic number

A

The smallest particle of an element that retains the properties of that element is a(an) A. Atom B. electron C. proton D. neutron

A

The smallest particle of an element that retains the properties of that element

Atom

All atoms of the same element have the same A. number of neutrons B. number of protons C. mass numbers D. mass

B

The atomic mass of an element is the A. total number of subatomic particles in its nucleus B. weighted average of the masses of the isotopes of the element C. total mass of the isotopes of the element. D. average of the mass number and the atomic number for the element

B

The atomic number of an element is the total number of which particles in the nucleus? A. neutrons B. protons C. electrons D. protons and electrons

B

Who conducted experiments to determine the quantity of charge carried by an electron? A. Rutherford B. Millikan C. Dalton D. Thomson

B

the comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following? A. the atoms are indivisible B. that atoms are very small C. that atoms are very large D. that in a copper penny, there is one atom for every person on Earth

B

All atoms are A. positively charged, with the number of protons exceeding the number of electrons B. negatively charged, with the number of electrons exceeding the number of protons. C. neutral, with the number of protons equaling the number of electrons D. neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons

C

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that. A. all of Dalton's hypotheses are correct B. atoms of an element can have different number of protons C. atoms are divisible D. all atoms of an element are not identical but they must all have the same mass

C

Dalton's atomic theory included which idea? A. All atoms of all elements are the same size B. Atoms of different elements always combine in one-to-one ratios. C. Atoms of the same element are always identical D. Individual atoms can be seen with a microscope

C

Which of the following was NOT among Democitus'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

C

Who was the man who lived from 460B.C.- 370 B.C. and was among the first to suggest the idea of atoms? A.Atomos B. Dalton C. Democritus D. Thomoson

C

An element has an atomic number of 76. The number of protons and electrons in neutral atom of the element are A. 152 p and 76 e B. 76 p and 0 e C. 38 p and 38 e D. 76 p and 76 e

D

Isotopes of the same element have different A. positions on the periodic table B. chemical behavior C. atomic numbers D. mass numbers

D

The sum of the protons and neutrons in an atom equals the A. Atomic number B. Nucleus number C. atomic mass D. mass number

D

Which of the following is necessary to calculate the atomic mass of an element? A. the atomic mass of carbon-12 B. the atomic number of the element C. the relative masses of the element's protons and neutrons D. the masses of each isotope of the element

D

Which of the following is true about subatomic particles? A. Electrons are negatively charged and are the heaviest subatomic particle B. Protons are positively charged and the lightest subatomic particle C. Neutrons have no charge and are the lightest subatomic particle D. The mass of a neutron nearly equals the mass of a proton.

D

the weighted average of the masses of the isotopes of an element

atomic mass

the number of protons in the nucleus of an element

atomic number

a negatively charged subatomic particle

electron

atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom

isotope

the total number of protons and neutrons in the nucleus of an atom

mass number

a subatomic particle with no charge

neutron

the central part of an atom, containing protons and neutrons

nucleus

A positively charged subatomic particle

proton