Atomic Particles
This positively charged subatomic particle is found in the nucleus and has a relative mass of about one
What is a proton?
This early atomic theory states that all matter is composed of atoms.
What is Dalton’s Atomic Theory?
This element has atomic number 24
What is chromium?
These are atoms with the same number of protons but different numbers of neutrons.
What are isotopes?
The contributions from all isotopes are added to find this value for an element.
What is atomic mass?
This neutral subatomic particle is found in the nucleus and has a relative mass of about one.
What is a neutron?
This model describes the atom as a sphere with positive charge spread throughout and negatively charged electrons in fixed positions.
What is Thomson’s Plum Pudding Model?
This element has 21 protons.
What is scandium?
This number is the sum of an atom’s protons and neutrons.
What is the mass number?
The fractional abundances of all isotopes of an element must add up to this.
What is 1, or 100%?
This negatively charged subatomic particle surrounds the nucleus and has a relative mass of about 1/1840.
This model describes an atom as mostly empty space with a small, dense nucleus.
What is Rutherford’s Nuclear Model?
This element has atomic number 55.
What is cesium?
In isotope notation, the upper-left number next to the element symbol represents this.
What is the mass number?
Element X has isotope mass contributions of 2.17 amu and 43.53 amu. What is their combined contribution?
What is 45.70 amu?
These two subatomic particles are located in an atom’s nucleus.
What are protons and neutrons?
According to Rutherford’s Nuclear Model, this central part of the atom contains all of its positive charge and most of its mass.
What is the nucleus?
This element has 44 protons
What is ruthenium?
Give the symbolic notation for neon-22, whose atomic number is 10.
What is 1022Ne?
Element X has isotope mass contributions of 2.17 amu, 43.53 amu, 5.03 amu, and 1.27 amu. What is its total atomic mass?
What is 52.00 amu?
This subatomic particle’s number identifies the element and is called the atomic number.
What is a proton?
In Rutherford’s model, these negatively charged particles move through the mostly empty space surrounding the nucleus
What are electrons?
This element has atomic number 65.
What is terbium?
Give the symbolic notation for uranium-234, whose atomic number is 92.
What is 92234U?
Antimony has two isotopes with masses 120.90 amu and 122.90 amu. If the fractional abundance of the first isotope is 0.570, what is the fractional abundance of the second isotope?
What is 0.430?