1
What is the smallest unit of an element?
Atom
What is the charge of a proton?
Positive
What is the atomic number of Boron?
5
Which element is located in Group 1, Period 1?
Hydrogen
What is the name of Group 18 on the periodic table?
Noble gases
What is the term for the number of protons in an atom?
Atomic number
Which subatomic particle has no charge?
Neutrons
What is the symbol for Sodium?
Na
What is an isotope?
Atoms of the same element but with different mass numbers
Which group contains the alkali metals?
group 1
What is the trend for atomic radius across a period from left to right?
It decreases
Name one property that distinguishes transition metals from main group elements.
Transition metals are unreactive compared to main group elements
What is the electron configuration for Carbon?
1s² 2s² 2p²
Magnesium has 3 natural isotopes. Magnesium-24 has an abundance of 78.7%, Magnesium-25 has an abundance of 10.1%, Magnesium-26 has an abundance of 11.2%. Calculate the relative atomic mass.
24.33
Calculate the number of neutrons in an atom of Chlorine-35.
18 (35 - 17)
Which element has the electron configuration 1s² 2s² 2p⁶
Neon
Electron configuration for Chromium
1s22s22p63s23p64s13d5
Atomic radius ________ across a period because __________.
decreses, the atomic number and nuclear charge increases so the attraction between the valence shell and nucleus increases.
What is the Lewis structure for the chloride ion Cl⁻?
• •
• Cl- •
• •
• •
What is the Lewis dot structure of Phosphorus
••
• P •
•
What is the Noble gas configuration for Fluorine?
[He]2s22p5
Electron configuration of Be+2
1s²2s²
Why do transition metals tend to form colored compounds, while main group elements typically do not?
Transition metals have partially filled d orbitals. Main group elements do not have these d-orbital transitions, so their compounds are often colorless.
Every orbital in a sublevel is singly occupied before any orbital is doubly occupied.
Calculate the relative atomic mass of element X if it has two isotopes: X-29, abundance = 70% and X-30, abundance = 30%.
Ar (X)= 29.3