Fichas
Elements 1.1
Fichas del conjunto (25)
- 1What are atoms?Atoms are the building blocks of every substance in the universe.
- 2What are elements? and how many atoms are in an element?Elements are the most basic materials for building the world.Elements are substances that are made up of only one atom.
- 3What is an STM and what does it stand for?Scanning Tunnelling Microscope is the only type of microscope powerful enough to obtain images of atoms.
- 4What are the two types that elements classified into?Metallic and non-metallic elements
- 5What are some metallic elements properties?
- 6What are some non-metallic elements properties?-Not shiny
-Do not conduct heat or electricity
-Break when you bend them
-Non-metals often referred to as being Brittle - 7How many elements are known? and how many of them occur naturally?There are 118 known elements, but only 91 of them occur naturally.
- 8What are the three different ways in which atoms are arranged in Elements?-Single atoms
(Monatomic)
-Cluster of atoms (Molecules)
-large grid(Lattices)
- 9What is a Monatomic?An element that consists of just single atoms
- 10What are the six of the 92 naturally occurring elements being monatomic and also non-metallic?These 6 are helium,neon,argon,krypton,xenon and radon
- 11What are Molecules?Molecules are clusters of two or more atoms bonded or joined together
- 12Why is it that some elements have a molecular formula such as <---------------It's because molecular formulas show what atoms are in a molecule and how many there are of each. for example, O2 shows that each oxygen molecule has two oxygen atoms.
- 13What is Carbon and what is the most famous type?Carbon is unique among the non-metallic elements in that it can form very large molecules of almost any size. The most famous type is buckyball.
- 14What percentage of the known elements is metal?80%
- 15What are lattices and what does this structure do?Lattices are large grid-like structures, this structure makes metals strong and solid at room temperature.
- 16What happens in metal lattices?In metal lattices, the atoms are only weakly joined to each other.As a result, metals can be bent and drawn into wires.
- 17What are the two types of carbon that form lattices?Diamond & Graphite
- 18Why is it that Diamond is the hardest natural substance?In Diamond, the carbon atoms are bonded strongly to each other in four directions.
- 19What happens in non-metallic lattices?In non-metallic lattices, the atoms are strongly bonded to each other.This makes them hard to brittle.
- 20What are allotropes? and what are the allotropes of carbon?Allotropes are different forms of the same element.The following are the allotropes of Carbon-:
1-Charcoal 2-Graphite 3-Diamond 4-Carbon fibre 5-Buckyballs and nanotubes
- 21What is Charcoal used for?Charcoal has many beneficial uses such as in the use of sketching, in the process of smelting iron, used as tablets and gas filter in gas masks.
- 22Graphite?In graphite, the atoms bond together in sheets that can slide over one another.This makes graphite a good lubricant.
- 23Diamond?Carbon in the form of diamond is the hardest substance on earth because the bonds between the carbon atoms are extremely strong.
- 24Carbon fibre?Carbon fibre is very light , very strong and flexible and so is often used in sporting equipment such as bike frames.
- 25Buckyballs and nanotubes?Buckyballs are balls of 60 carbon atoms that have the same geometric shape as the soccer ball. The discovery of the buckyball led to the development of nanotubes. Nanotubes are a form of carbon that can be thought of as a sheet of carbon rolled into a tube.
