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Du hast 6 Minuten um die 13 Fragen in diesem Quiz zu beantworten.
All are made up of . A that is made of only one type of is called an . There are about one different , and they are arranged in the periodic . The of the periodic contain with properties.
What do elements form when they react?
Compounds
Molecules
Substances
Atoms
Complex structures
Ions
Mixtures
Atoms of each element are represented by a chemical symbol.
Atoms are made up of a small central ❌, which is made up of ❌ and ❌ Around this, there are ❌ which move in specific ❌ in an 'orbit'. They are often called ❌.
Fill in the table to complete the relative masses and charges of subatomic particles.
Why does an atom have no overall charge on it?
Because the number of e is equal to the number of , and the do not have a , so there is no overall on an atom.
How are different ions formed?
P ions are formed by electrons; ions are formed by electrons.
All atoms of a particular element have the same number of protons.
NUMBER - The number of in an atom of an element.
NUMBER - The sum of the and n in an atom.
What are the elements in Group 0 of the periodic table called, and how many electrons do they have in their outer energy level?
Noble gases, eight
Noble gases, four
Noble gases, zero
Halogens, eight
Halogens, six
Unreactive gases, eight
Noble gases are unreactive because they have full outer shells.
Compounds formed from and n consist of . They are held together by bonds. Compounds formed from n and n consist of . They are held together by bonds.
Balance the following equations by picking the correct numbers of each reactant and product.
1) Fe₂O₃(s) + HCl(aq) ==> FeCl₃(aq) + H₂O(l)
2) Fe(s) + O₂(g) ==> Fe₃O₄(s)
3) Al(s) + H₂SO₄(aq) ==> Al₂(SO₄)₃(aq) + H₂(g)
The law of of states that no are or during a chemical reaction, so the mass of the is equal to the mass of the .