Chapter 29-Atomic Structure Flashcards
About how many elements are in the periodic table?
100 elements.
What tool do you use to see atoms?
You use a certain type of microscope called an ‘electron microscope.’
What are the tiny particles inside an atom called?
Sub-atomic particles.
What are the three types of sub-atomic particles and what are their charges?
Electron-negative
Proton-positive
Neutron-neutral
What are the locations of protons, neutrons and electrons in the atom?
Proton-nucleus
Neutron-nucleus
Electron-outside nucleus
What unit do we use to measure the mass of atoms?
We use the atomic mass unit. (a.m.u)
What are the relative masses of protons, neutrons and electrons?
Electron-1/1840 unit.
Proton-1 unit
Neutron-1 unit
What are the relative charges of neutrons, protons, electrons.
Electron is -1 unit.
Neutron is 0.
Proton is +1 unit.
What is the planetary model?
It is the model created by Nicholas Bohr to show the orbit of the electrons around the nucleus of the atom. (Also called shells.) This orbit gives rise to an electron cloud.
How many electrons and protons are in an atom?
Atoms are neutral in charge, therefore the number of protons and electrons must be the same to maintain balance.
What is the atomic number of an atom?
It is the number of protons in the nucleus of that atom.
What is the mass number of an atom?
Mass number = number of protons + number of neutrons.
How do you find the position of an atom in the periodic table?
The position of an atom in the periodic table is the atomic number of it.
How do you find the number of neutrons in an atom?
Number of neutrons = mass number - atomic number.
What is an atom?
An atom is the smallest particle of an element that still retains the properties of that element.
