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Q 1/10
Score 0
1. Mendeleev left blank spaces in his periodic table where he thought elements that had not yet been discovered should go. He was able to predict the properties of these elements by
60
noting periodic trends in the properties of known elements that surrounded the blank spaces in the periodic table
studying the new elements produced by radioactive decay
studying the spectra of stars that contained them
testing their properties such as melting point, density, and valence
Q 2/10
Score 0
Which of the following statements best describes the alkaline earth elements?
60
They have two valence electrons, and they form ions with a 2- charge
They have one valence electron, and they form ions with a 1- charge.
They have two valence electrons, and they form ions with a 2+ charge
They have one valence electron, and they form ions with a 1+ charge.
10 questions
Q.
1. Mendeleev left blank spaces in his periodic table where he thought elements that had not yet been discovered should go. He was able to predict the properties of these elements by
1
60 sec
Q.
Which of the following statements best describes the alkaline earth elements?
2
60 sec
Q.
Which pair are elements of which the chemical properties of those elements are most similar.
3
60 sec
Q.
Potassium and Cesium both belong to which family?
4
60 sec
Q.
Which element is in period five group 2
5
60 sec
Q.
How was Mosely's table different than Mendeleev's?
6
60 sec
Q.
Which one of the following is a halogen?
7
60 sec
Q.
Which group is the most reactive METALS?
8
60 sec
Q.
A common characteristic of the halogens is that they
