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4.7 Trends in Periodic Properties -- Part 3
The group number and number of valence electrons should be given.
The elements are made of atoms.
The elements combine to form compounds.
New 11X, 10X, 10X, 92X, 92X atoms appear when some atoms disappear in a chemical reaction.
The particle is negatively charged.
The neutron is 2000 times heavier than a protons.
The largest part of the atom is the nucleus.
The electrons are not inside the nucleus.
There are no net charges for the neutron.
The protons and electrons make up most of the atom's mass.
The electron and the protons have the same mass.
The number of protons is the mass number.
The number of electrons in an atom is equal to the number of letters.
electrons are lost more easily than metalloids.
58 28Ni is the most abundant nickel element.
88 38Sr is the most abundant strontium element.
There are problems related to the topics in this chapter.
Group 2A (2) has the elements of alkaline metals.
Sulfur is a component of the body.
Group 5A nucleus is positive charged.
Ca and like charges repel each other.
Both 42X and 43X have 20 protons.
20X and 20X are related to calcium.
They all have the same number of electrons and protons.
There are 42 mass numbers in 42X.
Both of them have 20 neutrons.
There are 16 protons and 16 electrons in both of them.
Both of them have 22 neutrons.
Group 5A is comprised of Period 6 Dant.
Less energy is needed to remove them.
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