Chemistry- Chapter 4 (2)

Alpha radiation has alpha particles which have a ____ charge

2+

What is the total number of subatomic particles in the nucleus of an atom 209/83x?

209

Consider an element Z that has 2 naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 25 is 35% abundant; the isotope with a mass number of 28 is 65% abundant. What is the average atomic mass for element Z?

26.95

Each alpha particle contains ____ protons and ___ neutrons

2; 2

The unit _____ is one-twelfth the mass of a carbon atom

AMU

The weighted average of the masses of the isotopes of an element is called _________

Atomic Mass

The number of protons in the nucleus is called the _________

Atomic Number

________ is the number of protons in the nucleus of an element

Atomic Number

A beta particle is an _____

Electron

____ rays are the highest energy rays

Gamma

An alpha particle is the same as a _____ nucleus

Helium

Atoms with the same number of protons but different numbers of neutrons are called ____

Isotopes

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

Isotopes

When an atom emits radiation is _____ energy

Looses

What information do you need to know to determine the number of neutrons in the neutrons?

Mass #, Atomic #

The sum of the protons and neutrons in an atom is called the ________

Mass Number

The total number of protons and neutrons in the nucleus of an atom is called _____

Mass Number

What does the number 84 in the name krypton-84 represent?

Mass Number

During beta radiation _____ charges are emitted

Negative

Isotopes of the name element have different numbers of _______

Neutrons

Gamma rays have _____ charge

No

How make protons, electrons, and neutrons does na atom with atomic number 70 and mass number 125 contain?

P- 70, E-70, N-55

The atomic number of an element is the total number of which particles in the nucleus?

Protons

The mass number of an element is equal to the number of ____ and ______

Protons and Neutrons

All atoms of the same element have the same number of ________________

Protons and electrons

Protons and neutrons are made of subatomic particles called ______

Quarks

The rays and particles emitted during a nuclear reaction are called ________

Radiation

Unstable nuclei lose energy by emitting radiation in a process called _______

Radioactivity

The atomic mass of an element is defined as ___________________

Weighted average mass of the isotopes of that element

A fictitious element X is composed of 15.0 percent 65X, 60.0 percent of the isotope 66X. Estimate the atomic mass of element X

66.35

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are _____

76