A
What subatomic particle has a negative charge?
Electron
What particles are in the nucleus?
Protons and neutrons
What subatomic particle has a positive charge?
Proton
How many electrons can the first, second, and third energy shells hold (in the 8th-grade model)?
2, 8, and 8.
What subatomic particle has no charge?
Neutron
What is the atomic symbol for sodium?
Na
A positively charged ion is a _________.
If an atom has 5 protons, 6 neutrons, and 5 electrons, what would its net charge be?
+5
0
-5
Total = 0
Which is a compound?
Cl, H₂, CO₂, O₂
Which is an element?
CO₂, H₂O, O₂, NaCl
Compound: CO2
Element: O₂
A negatively charged ion is a(n) _________.
anion
Two or more atoms bound together by the electrical force are called a(n)
A. atom
B. element
C. molecule
D. proton
molecule
What element has atomic number 8?
Oxygen
What are the horizontal rows on the periodic table of elements called?
Periods
What are the two important categories of elements?
Metals and Non-Metals
2/3 of the elements on the periodic table of elements are _______________
Metals
Elements in column 13 have how many valence electrons?
A. 1
B. 3
C. 5
D. 13
3 valence electrons
What are the vertical columns on the periodic table of elements called?
Groups
How many protons, electrons, and neutrons does Hydrogen have?
1 proton
1 electron
0 neutrons (atomic mass - atomic number: 1-1=0)
Elements in the same vertical group have similar ______________.
Chemical properties
Protons and ________ have similar size and mass, while _________ are much smaller.
Protons and NEUTRONS have similar size and mass, while ELECTRONS are much smaller.
How many protons, electrons, and neutrons does boron have?
5 protons
5 electrons
6 neutrons (atomic mass - atomic number: 11-5=6)
How many vertical columns/groups are on the periodic table of elements?
Eighteen
What element has atomic number 3?
Lithium
How many electrons does helium have?
How many valence electrons does helium have?
2 electrons
2 valence electrons
What are the four properties of metals?
Shiny, Ductile, Malleable & Conductive
Which of the following correctly pairs the names and charges of the two subatomic particles found in an atom’s nucleus?
A) Proton: +1, Neutron: 0
B) Electron: 0, Neutron: +1
C) Proton: –1, Neutron: 0
D) Proton: +1, Electron: –1
A) Proton: +1, Neutron: 0
What are the subatomic particles in the atom, and what charges do they have?
Protons: +1
Neutrons have no charge
Electrons: -1
Fluorine has a (rounded) mass of 19 amu. How many neutrons does an atom of fluorine have?
# of neutrons = atomic mass - atomic number
= 19 - 9
= 10 neutrons
An element that is found in any phase at room temperature is dull, brittle, and a poor conductor of heat and electricity.
A non-metal
Name one element that has similar chemical properties as copper.
Silver, Gold or Roentgenium