5390902
Description
Flashcards by Ahmed Almohammed, updated more than 1 year ago
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Created by Ahmed Almohammed
almost 8 years ago
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| Question | Answer |
| How can Scientists explain and control the properties of Compounds and Elements? | Scientists can explain and control the properties of compounds and elements by understanding the atoms that make up them. |
| What is an atom? | Atoms make up everything around you, but they are so small to see with the naked eye. |
| How do scientists see atoms? | Scientists use a special powerful microscope called the scanning tunnelling microscope or "STM" to see atoms. |
| What is the atomic theory of matter? | Democritus believed that matter was composed of fundamentally indivisible particles, called "atomos" or "atoms" |
| What is a scientific model ? | A scientific model is a simplified idea that can be used to help make predictions or test assumptions. |
| Who was John Dalton ? | John Dalton is considered to be the first person to propose the fundamental ideas behind the modern atomic theory of matter. |
| What are the four theories of matter that Dalton proposed? | NEXT____________________ |
| (1) | -All matter is composed of indivisible particles called atoms |
| (2) | -Elements are made up of only one type of atom. |
| (3) | -Compounds are made up of more than one type of atom. |
| (4) | -Atoms cannot be created or destroyed but can be rearranged to form different substances. |
| How many atoms are known and what does each atom have? | There are 117 known atoms, all atoms have a unique set of characteristics known as properties. |
| Are atoms heavy solid balls? if not, then what are they? | No, Atoms are complicated internal structure, it's the internal structure that gives each element its properties. |
| What are the subatomic particles? | |
| How do Protons, Neutrons, and Electrons make up an atom ? | |
| What is a mass number? | The number of protons and neutrons in an atom is called the mass number. |
| Identify the number of neutrons in this atomic symbol. <-------------------- | mass number(12) - atomic number(6) = number of neutrons = 6 Answer is 6 <------------ |
| What are electron shells? | Electron shells are areas around the atom in which electrons spin. |
| Why do the electrons in an atom don't fly off? | This is because the electrons are negatively charged and the protons are positively charged, therefore, they attract each other like the opposite poles of magnet |
| If the nucleus of an atom was the size of a golf ball, then what would be the size of the electron cloud? ANSWER= The size of a .... -----> | |
| POP UP QUESTION What is 9+10=___ ANSWER---------------------->>> |
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