Karteikarten
1.1 Elements
Karten in diesem Stapel (25)
- 1How many types of atoms are there?About 100 types
- 2What do scientists use to obtain an image of atom?scanning tunnelling microscope (STM)
- 3What are elements?substances that are made up of just one type of atom
- 4What are properties?The unique set of characteristics of an element
- 5Properties of metallic elements:shiny, solid at room temperature (except mercury), good conductors of heat electricity, can be bent, can be stretched
- 6Examples of metallic elementsaluminium, iron, mercury, gold and silver
- 7Properties of non-metallic elements:dull, do not conduct electricity or heat and brittle
- 8Examples of non-metallic elementschlorine, carbon, iodine and sulfur
- 9How many elements are there?118
- 10What are physical properties?the state
melting and boiling point
conducts electricity and heat or not
brittle/malleable/ductile - 11What helps the scientists understand the physical properties of elements?They arrange the elements with its symbols in aperiodic table from lightest to heaviest which assist them to understand the physical properties of elements
- 12How do atoms are arranged in elements?a single atom
cluster of atoms called molecules
large grid-like structures called lattice - 13What does monatomic mean?A single atom
- 14How many monatomic elements are there?92
- 15What are the 6 that are monatomic?helium, neon, argon, krypton, xenon and radon
- 16What does most non-metallic elements are made up of?molecules
- 17What are molecules?clusters of two or more atoms bonded together.
- 18What does oxygen made up of?billions of oxygen molecules
- 19What is carbon?Carbon is unique among the non-metallic elements in that it can form very large molecules of almost any size.
- 20Examples of allotrope of carbondiamond, graphite, charcoal, carbon fibre, nanotubes and buckyball
- 21How many percent of elements are metal?80%
- 22What are crystal-lattices?Instead of molecules, metallic elements are form by large grid-like structure called lattices.
- 23Why does metal can't be break?the atoms in metallic lattices can slide and move on each other
- 24What non-metallic elements form crystal-lattices?diamond, graphite
- 25Why are diamonds known as the hardest natural substances on Earth?The carbon atoms are bonded strongly to each other in four directions.
Informationen
- Beschreibung
- Karteikarten am 1.1 Elements, erstellt von st m am 28/04/2016.
- Erstellt von
- st m
- Aufrufe
- 1
- Bewertung