Chemical Symbols
What element is represented by the chemical symbol "H"?
Hydrogen
How is the periodic table of elements structured?
Increasing atomic number (how many protons are in the nucleus of an atom)
Who was the first to suggest the concept of atoms?
The concept of atoms was first proposed by the ancient Greek philosopher Democritus
Elements
What category of elements is typically shiny, conducts heat and electricity well, and includes examples like copper and aluminum?
Metals
Which noble gas is denoted by the chemical symbol "He"?
Helium
In the periodic table, elements with similar properties are grouped together in vertical columns. What are these columns called?
Groups (or Families)
In 1897, what important discovery did J.J. Thomson make which is represented in his Plum Pudding model?
Presence of negatively charged particles, now known as electrons
A substance containing atoms of two or more elements bonded together in fixed proportions is known as a ...
Compound
What category of elements is generally dull in appearance, poor conductors of heat and electricity, and includes elements like sulfur and carbon?
Non-Metals
What is the chemical symbol for Iron?
Fe
Why do elements have chemical symbols (like "H" for hydrogen or "O" for oxygen) in the periodic table?
Chemical symbols are used to represent elements in a concise and standardized way, making it easier to communicate and write chemical formulas.
Which scientist discovered that atoms were made up of a nucleus that contained positively charge particles called protons?
Ernest Rutherford
Which gaseous element is essential for human respiration?
Oxygen (O)
Is carbon (C) a metal or non-metal?
What is the chemical symbol for Potassium?
K
Elements in Group 17 which include fluorine, chlorine , bromine, iodine, and astatine are called?
Halogens
Who proposed the atomic model that features electrons in orbits around the nucleus, and is still used as a simplified representation of atomic structure?
Neils Bohr
What is the compound composed of sodium (Na) and chlorine (Cl)?
Sodium Chloride (NaCl) or Table Salt
Is Nickel a metal or non-metal?
Metal
What is the chemical symbol for Mercury?
Hg
What category of elements includes helium, neon, and argon in Group 18 of the periodic table?
Noble Gases
In the 1930s, what significant discovery is associated with James Chadwick?
The nucleus of an atom also contained neutrally charged particles called Neutrons.
What is the chemical symbol for the element commonly used in construction and manufacturing, known for its strength and magnetic properties?
Iron (Fe)
Name the category of elements that exhibit properties of both metals and non-metals and are located along the "staircase" on the periodic table.
Metalloids