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Flashcards- Elements 1.1
Karten in diesem Stapel (25)
- 1What is every substance in the universe made up of?Every substance is made up of building blocks called atoms.
- 2How many types of atoms are there?There are about 100 types of atoms.
- 3What does STM stand for?Scanning Tunnelling Microscope
- 4What microscopes are used to see atoms?Scanning tunneling microscope (STM)
- 5What are elements?Elements are substances that are made up of just one type of atom.
- 6What is the air you breathe made up of?The air you breathe is made up of two elements- nitrogen and oxygen
- 7What are the two classifications of elements?Metallic and non-metallic
- 8What are some examples of metallic elements?Aluminium, iron, mercury, gold and silver
- 9What are some properties of metallic elements?-Tend to be shiny
-Can be stretched into wires
-Can be bent and hammered into sheets
-Are good conductors of heat and electricity - 10What are some examples of non-metallic elements?Carbon, Iodine, Chlorine and Sulfur
- 11Which element is a liquid at room temperature?Mercury is a liquid at room temperature
- 12What happens to non-metallic elements at room temperature?They tend to be solids or gases at room temperature.
- 13What are some of the properties of non-metallic elements?-Tend to be dull
-Do not conduct heat or electricity
-Break or crumble when you bend them - 14How many known elements are there?There are 118 known elements.
- 15How many of the elements occur naturally?Only 91 of them occur naturally.
- 16What helps scientists understand the physical properties of elements?Scientists display all the known elements and their symbols in a table called the periodic table which lists the elements from lightest to heaviest which helps the scientist understand the physical properties.
- 17What can atoms in elements exist as?-As single atoms
-Clusters of atoms called molecules
-In large grid-like structures called lattices - 18What are physical properties?Physical properties determine whether the: -Element is solid, liquid or gas.
- Its melting and boiling point.
- How well it conducts heat or electricity
-If it can bend or whether it breaks when a force is applied. - 19What are monatomic elements?An element that consists of just a single atom.
- 20How many monatomic elements are there?There are only 6 of the 92 naturally occurring elements being monatomic.
- 21What are the 6 monatomic elements?Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
- 22What are molecules?Molecules are clusters of two or more atoms bonded together.
- 23How many oxygen atoms does each oxygen molecule contain?Each oxygen molecule contains 2 oxygen atoms
- 24What are lattices?Lattices are large grid-like structures
- 25What can metals and non-metals both form?They can both for crystal lattices