Element Basics
What is the smallest unit of an element that still retains its chemical properties?
An Atom
What trend increases as you move from left to right across a period?
Electronegativity
What are the elements in Group 1 of the periodic table called?
Alkeli metals
I'm a gas you breathe in everyday and make up about 21% of Earth's atmosphere, what am I?
Oxygen (O)
I am used to fill balloons because I am lighter than air and non-flammable.
Helium (He)
What does the atomic number of an element represent?
# of protons in the nucleus
Which element has the largest atomic radius? (sodium, Magnesium, or Aluminum)
Sodium (Na)
What group contains very stable elements that rarely react?
Noble Gases
I'm a shiny metal that conducts electricity and used in wiring and pennies.
Copper (Cu)
This element is used in thermometers but toxic to humans.
Mercury (Hg)
What is the chemical symbol for potassium?
K
What happens to ionization energy as you move down a group?
It decreases
Which group of elements forms salt when combined with metals?
Halogens
I glow bright red orange in signs, what am I?
Neon (Ne)
Was discovered by Marie Curie and used in cancer treatments.
Radium (Ra)
What element has an atomic number of 26 and used in steel production?
Iron (Fe)
Why does electronegativity decrease down a group?
Atomic radius increases, it weakens attraction to electrons
Which family of elements includes Iron (Fe), Copper (Cu), and Gold (Au)?
Transition metals
I'm a soft silvery metal that explodes in water.
Sodium (Na)
Silicon (Si) is a key element in this modern technology.
Computer chips / Electronics
What term describes elements that have the same # of protons and neutrons?
Isotopes
Place these elements in order if decreasing electronegativity (F, C, N)
C< N < F
What is the name for the elements found along the "staircase" line that have properties of both metals and nonmetals?
Metalloids
I'm radioactive, used in nuclear reactors and atomic bombs.
Uranium (U)
What element was named after the scientist who created the periodic table?
Mendelevium (Md)