Test Chapter 4 and 25
Terms in this set (43)
All atoms of the same element have the same _____.
1. All elements are composed of tiny indivisible particles called atoms
2. Atoms of the same element are identical. Atoms of any one element are different from those of any other element.
3. Atoms of different elements combine in simple whole-numbered ratios to form chemical compounds
4. In chemical reactions, atoms are combined, separated, or rearranged - but never changed into atoms of another element
Neutrons= mass number - atomic number
How is the number of neutrons in the nucleus of an atom calculated?
mass numbers and neutrons
Isotopes of the same element have different _____.
What does the number 84 represent in the name krypton-84?
The smallest particle of an element that retains the properties of that element is a(n
Atoms of the same element are always identical.
Dalton's atomic theory included which idea
Atoms are tiny indivisible particles.
Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?
atomic number of an element is the total number of which particles in the nucleus?
The sum of the protons and neutrons in an atom equals the
True or False. Atoms of isotopes of an element have different numbers of protons.
the masses of each isotope of the element
Which of the following is necessary to calculate the atomic mass of an element?
A cathode ray consists of
The electron was discovered by
What is the charge on an alpha particle?
Rutherford called the core of the atom the
Which of the following particles is normally found outside the nucleus of the atom
The atomic number of an atom is the same thing as the number of
An element's identity is based on its
unequal number of protons and electrons.
An ion always contains an
different numbers of neutrons
Two atoms are isotopes if they contain
The atomic mass unit (amu) is defined in terms of
atoms with the same number of protons, but different numbers of neutrons of an atom
the total number of protons and neutrons in the nucleus of an atom
the number of protons in the nucleus of an element
the weighted average of the masses of the isotopes of an element
Who was the man who lived from 460b.c- 370b.c and was among the first to suggest the idea of atoms
Who conducted experiments to determine the quantity of charge carried by an electron?
# of protons and # of electrons
All atoms are neutral and have the same..
protons and neutrons
The particles are found in the nucleus of an atom are..
amu (atomic mass unit)
What unit is used to measure weighted average atomic mass?
electrons < protons < neutrons
Rank the subatomic particles from least to greatest mass
Would you expect two electrons to attract or repel each other?
What is the charge of the nucleus of an atom?
What makes up most of the volume of the atom?
protons, neutrons, electrons
3 subatomic particles
Name the heaviest subatomic particle.
Alpha, Beta, Gamma
What are the three types of radiation?
consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. Repelled by densely packed regions of positive charge.
a fast-moving electron emitted by radioactive decay of substances. Release of an electron from the breaking apart of a neutron in an atom to change it into a proton.
most energetic form of electromagnetic radiation. product of radioactive atoms. Release of photons. Radiation but no change in the atom.