Elements and Atoms
Periodic Table
Ionic Bond
Covalent Bond
RANDOM
100
Explain why elements are the building blocks of matter?
Because ALL matter are made up of one or more elements.
100
What determines the many properties of the elements including the ways in which they bond with other atoms?
Valence electrons?
100
What happen to the atom when it loses an electron?
it becomes positive.
100
What is a covalent bond?
when two atoms share electrons.
100
Is air a compound or a mixture?
mixture
200
What is a mixture?
is two or more substances or elements that are not combined chemically.
200
What is the trend in the periodic table, with regards to the atomic number?
From left to right, top to bottom, the atomic number increases.
200
What happen to the atom when it gains an electron?
it becomes negative.
200
How many electrons are shared in a double bond? triple bond?
four. six.
200
Elements in group 17, the halogen family are very reactive because their atoms have ________ valence electrons?
seven.
300
Water is a compound. Does water contain elements? If yes, list them down.
Yes. hydrogen and oxygen.
300
Which two elements in the periodic table are liquids?
mercury and bromine
300
What is an ionic bond?
an attraction between oppositely charged ions.
300
Which compound is formed out of covalent bonding? NaCl or H2O?
H2O.
300
Which sub-atomic particles are located outside the nucleus? What is it's charge?
Electron - negative
400
What are the four elements that ALL livings things made of?
Hydrogen, Carbon, Nitrogen and Oxygen
400
Which element is more reactive sodium or potassium? Explain.
Potassium because it is in a lower period the more reactive the elements are.
400
Why do sodium (Na) and chlorine (Cl) bond together?
They have opposite charges and opposite charges attract.
400
True or False. Covalent bonds are usually form between atoms of non-metals?
True.
400
What does the atomic number tells us?
It is the number of protons an atom or element.
500
What is a compound? Give 1 example.
is made up of two or more elements chemically combined. Example : water
500
Why do the noble gases not combine with oxygen or other elements?
The noble gases have eight valence electrons, which makes them very stable.
500
What is the overall charge on the atom of an element?
it is neutral.
500
What is the attraction that holds two covalently bonded atoms together?
The attraction of each atom's nucleus for the shared electrons.
500
Why do the properties of elements change in a regular way across a period?
The properties of elements change in a regular way across a period because the number of valence electrons changes regularly.
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