Atoms And Electronic Structure Flashcards
(25 cards)
What is an atom?
The smallest particle of an element that retains its properties.
What are the three subatomic particles?
Proton, neutron, and electron.
What is the relative charge of a proton?
1
What is the relative charge of a neutron?
0 (neutral)
What is the relative charge of an electron?
-1
What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative mass of an electron?
Almost 0 (1/1836)
Where are protons and neutrons found?
In the nucleus.
Where are electrons found?
In energy levels (shells) around the nucleus.
What is the atomic number?
The number of protons in an atom.
What is the mass number?
The total number of protons and neutrons in an atom.
What is an isotope?
Atoms of the same element with different numbers of neutrons.
What determines the chemical properties of an element?
The number and arrangement of electrons.
What is the maximum number of electrons in the first shell?
2
What is the maximum number of electrons in the second shell?
8
What is the electronic configuration of sodium (atomic number 11)?
2,8,1
What do group numbers in the periodic table tell you?
The number of electrons in the outer shell.
What do period numbers in the periodic table tell you?
The number of electron shells.
What is a noble gas?
An element in Group 0 with a full outer shell of electrons.
Why are noble gases unreactive?
Because they have a stable, full outer shell of electrons.
What is the electron configuration of oxygen (atomic number 8)?
26
What is the nucleus of an atom?
The small, dense centre containing protons and neutrons.
Why are atoms neutral?
Because they have equal numbers of protons and electrons.
