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Q 1/20
Score 0
Which of the following best describes an electron?
60
It has a positive charge and much more mass than a neutron.
It has a negative charge and about the same mass as a neutron.
It has no charge and about the same mass as a proton.
It has a negative charge and much less mass than a proton.
Q 2/20
Score 0
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atomâs nucleus?
60
â30
30
â25
25
20 questions
Q.
Which of the following best describes an electron?
1
60 sec
Q.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atomâs nucleus?
2
60 sec
Q.
What types of particles are found in the cloud surrounding the atomâs nucleus?
3
60 sec
Q.
A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
4
60 sec
Q.
A chemist is identifying the elements present in a sample of seawater. Which subatomic particle of an elementâs atoms always determines the elementâs identity?
5
60 sec
Q.
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
6
60 sec
Q.
The atoms of a certain element each contain 19 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
7
60 sec
Q.
Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?
8
60 sec
Q.
A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below. Which two atoms are of elements in the same group in the periodic table?
9
60 sec
Q.
Which pair of properties describes the elements in Group 18?
10
60 sec
Q.
The model of the periodic table below shows the locations of four elements. A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?
11
60 sec
Q.
Which information could a student determine from only the chemical formula of a protein?
12
60 sec
Q.
13
60 sec
Q.
Which of these formulas contain equal numbers of nitrogen atoms?
14
60 sec
Q.
15
60 sec
Q.
16
60 sec
Q.
17
60 sec
Q.
18
60 sec
Q.
19
60 sec
Q.
Some students in a chemistry lab conducted an investigation in which they added four different solid substances to separate beakers of water. They stirred the mixtures for one minute and then recorded their observations in the table below. Which substance most likely caused a new substance to be formed when mixed with water?
