Kemi 1 Flashcards
What is the periodic system?
A way of organizing elements based on their atomic number and properties.
How many groups are there in the periodic table?
18 groups.
What is the atomic number of an element?
The number of protons in the nucleus of an atom.
Which element has the atomic number 1?
Hydrogen.
What is the symbol for Gold?
Au.
What is molarity?
The concentration of a solution expressed as the number of moles of solute per liter of solution.
How many moles are in 1 gram of water (H2O)?
About 0.055 moles.
What is Avogadro’s number?
6.022 x 10^23, the number of particles in one mole of a substance.
True or False: The atomic mass of an element is equal to the mass number.
False.
What is the formula to calculate moles?
Moles = Mass / Molar mass.
Which element has the highest atomic number?
Oganesson.
What is the lightest element in the periodic table?
Hydrogen.
What does the period number in the periodic table represent?
The number of electron shells an element has.
What is the most common element in the Earth’s crust?
Oxygen.
What is the name of the group 17 elements in the periodic table?
Halogens.