Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
Name the sub-atomic particles present in an atom.
|
proton, electron, neutron
|
|
Describe 2 characteristics of proton
|
It is positively-charged and is located in the nucleus.
|
|
Explain why atoms are electrically neutral.
|
Atoms have equal number of protons and electrons, hence the positive charge will cancel out the negative charge.
|
|
Define atomic number / proton number.
|
The number of protons in an atom.
|
|
Define mass number / nucleon number.
|
The number of protons and neutrons in the nucleus of an atom.
|
|
Describe briefly how electrons are arranged in an atom.
|
Electrons are arranged in electron shells, where they can take in a fixed number of electrons.
|
|
State the maximum number of electrons in the 1st, 2nd and 3rd shell respectively.
|
1st shell: 2 electrons
2nd shell: 8 electrons 3rd shell: 8 electrons |
|
Determine the number of neutrons in Si atom.
|
From the Periodic Table, we observe that the proton number of silicon is 14 and the mass number is 28.
Hence, the number of neutrons is 14 (28 -14) |
|
What do you understand by outermost electrons?
|
Outermost electrons are found at the last shell of the atom.
Also known as valence electrons. |
|
What is the significance of outer electrons / valence electrons in an atom?
|
The number of outer electrons determine the chemical properties of the atom.
|
|
What is the relationship between the number of outer electrons and the position of the atom in the Periodic Table?
|
The number of outer electrons correspond to the Group number where the atom is placed.
|
|
what is the relationship between the number of electron shells to the location of the atom in the Periodic Table?
|
The number of electron shells in the atom correspond to the Period in which the atom is placed.
|