5276493
Description
Flashcards by Rawan Ibrahim, updated more than 1 year ago
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Created by Rawan Ibrahim
almost 8 years ago
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| Question | Answer |
| What are atoms? | They are the building blocks that make up every substance. |
| What are elements? | They are substances made of only one element. |
| What are properties? | THEy are a unique set of characteristics that identify the substance. |
| What are the two types of groups elements can be broadly classified into? | Metallic and non-metallic |
| What are some examples of metallic elements? | Aluminium, iron, mercury, gold and silver. |
| What are some properties of metals? | - They are shiny - Good conductors of heat and electricity - Can be bent and hammered into sheets - Can be stretched into wires |
| What is the only non-metal that is liquid at room temperature? | Bromine |
| What are some properties of non-metals? | - They are dull - Do not conduct heat or electricity - Break or crumble when you bend them |
| HOw are ash and charcoal formed? | By burning a piece of paper or wood. |
| How many known elements are there? | 118 |
| And how many of those known elements occur naturally? | Only 91. |
| What are the different ways atoms can be arranged inside an element? | They can exist as; - Single atoms - Clusters of atoms - Grid-like structures |
| What are some examples of physical properties? | - If the element is a solid, gas or liquid - How well it conducts heat or electricity - Can it bend - Does it break is a force is applied to it? |
| What is monatomic? | An element that consists of just single atoms. |
| How many monatomic elements are there out of the naturally occurring ones? | Only 6. |
| What is the name for the clusters if two or more atoms bonded together inside an element? | Molecular. |
| Why is carbon considered to be unique? | Because it can form very large molecules of almost anything. |
| What is the percentage of the known elements that are metal? | 80%. |
| What are crystal lattices? | A grid-like structure of atoms. |
| In metal lattices, is the atoms bond weak or strong? | Weak. That's why they can be hammered and bent into whatever shape. |
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