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Q 1/9
Score 0
The net charge on a n aluminum ion is +3 because there are -
30
13 protons and 10 neutrons in the nucleus
10 protons and 13 electrons in the atom
10 neutrons and 13 electrons in the atom
13 protons and 10 electrons in the atom
Q 2/9
Score 0
Potassium (K) has a smaller atomic mass than argon (Ar) even though the atomic number of potassium is larger than the atomic number of argon. Which of the following best accounts for this observation?
30
At STP, potassium is in the solid phase, but argon is a gas.
The most common isotopes of potassium have fewer neutrons than the most common isotopes of argon.
The most common isotopes of argon have more protons than the most common isotopes of potassium
It is easier for a potassium atom to lose an electron than it is for an argon atom.
9 questions
Q.
The net charge on a n aluminum ion is +3 because there are -
1
30 sec
Q.
Potassium (K) has a smaller atomic mass than argon (Ar) even though the atomic number of potassium is larger than the atomic number of argon. Which of the following best accounts for this observation?
2
30 sec
Q.
How many valence electrons does an oxygen atom have?
3
30 sec
Q.
Which of the following particles has a positive charge?
4
30 sec
Q.
Protons and neutrons have approximately the same -
5
30 sec
Q.
Equal numbers of protons and electrons make the atom -
6
30 sec
Q.
A chloride ion (Cl-) has the same number of electrons as a neutral atom of -
7
30 sec
Q.
A chemist is examining an unidentified element sample with oxidation states of +2, +3, and +6. The element has a shielding effect similar to that of potassium (K). Which statement about unidentified element is most likely true?
8
30 sec
Q.
The elements that are characterized by the presence of an incomplete d sublevel are called -
