Describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;
Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts; and
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Q 1/5
Score 0
Atoms of which two elements have a combined total of 23 protons?
30
Copper, Cu, and zinc, Zn
Sodium, Na, and magnesium, Mg
Boron, B, and carbon, C
None of these
Q 2/5
Score 0
A scientist performs tests on a sample of an element. The element is a shiny solid that conducts electricity and heat. The scientist is able to bend and flatten the sample when pressure is applied to it.
Based on this information, the element could NOT be a member of which group on the periodic table?
30
Group 12
Group 18
Group 8
Group 2
5 questions
Q.
Atoms of which two elements have a combined total of 23 protons?
1
30 sec
8.5b
Q.
A scientist performs tests on a sample of an element. The element is a shiny solid that conducts electricity and heat. The scientist is able to bend and flatten the sample when pressure is applied to it.
Based on this information, the element could NOT be a member of which group on the periodic table?
2
30 sec
8.5c
Q.
The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?
3
30 sec
8.5a
Q.
4
30 sec
8.5d
Q.
The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom.
In this model, which particle determines the reactivity of this atom?
