1. How did Dmitri Mendeleev deal with elements that had not yet been discovered?A. He left blanks for them in his periodic table, as he predicted they would be discovered.
B. He gave them names and properties and placed them in the table.
C. He created them in his laboratory and placed them in the table.
D. He ignored them, placing them in the table and shifting others when they were discovered. 2. Which of the following elements have properties similar to those of astatine (At)? A. F, Br, I B. Ar, S, P C. F, Ar, Ne D. Na, Mg, Al 3.What is true of the ionic size of the elements in a group as one moves from top to bottom in that group?
A. Ionic size stays the same within the group.
B. Ionic size does not vary in any predictable way within the group.
C. Ionic size decreases from top to bottom within the group.
D. Ionic size increases from top to bottom within the group.
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He couldn't just just imagine index and go with a flow, he left space for it in order to dicrover it through reactions.
What about the next question, the answer is A. F, Br, I, its properties similar to those of astatine (At).
The last one :D. Ionic size increases from top to bottom within the group.
Related Questions
Nuclei with ______ numbers of neutrons and protons are more stable.
Whether an ionic bond or a covalent bond forms, bonds form in order to make newly created substances ________ than the substances they were created from.a. less stable b. more stable c. less efficient d. more efficient
What's the size of a astatine Atom compared to a tellurium Atom
When electrons jump off, They (scientific term)Will give brainliest
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Creating electricity from wind is not regarded as contributing to the creation of greenhouse gases.
choices are:
deforestation
creating electricity from coal
creating electricity from wind
use of fertilizers
B. The first electron shell holds 8 electrons.
C. All atoms contain two electron shells.
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An electron's exact position cannot be pinpointed is the features of the electron cloud model of an atom. Therefore, option A is correct.
What is an electron cloud model ?
In 1926, Werner Heisenberg and ErwinSchrödinger created the electron cloud model. The model is a tool for aiding in the visualization of the electrons' most likely location within an atom.
The electron cloud model is another name for the contemporary theory. This is due to the fact that each orbital surrounding an atom's nucleus resembles a fuzzily arranged cloud.
According to definition, an electron cloud is the area around the nucleus of an atom where electrons are most likely to be found.
Thus, option A is correct.
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Answer: a
Explanation:
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Answer:
38.8 g
Explanation:
Density is just mass divided by volume, so if you know 2 of those 3 things you can solve for the other one.
Let's write it as: D = m/v
We know D, and we know v, so solve for m:
m = Dv
Now just plug in the the known values:
m = (0.98 g/ml)( 39.63 ml) = 38.8 g
(Notice how ml cancelled out, leaving grams, which is what we wanted for mass.)
b. 4
c. 8
d. 10
e. 13
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Answer: a contest in which you are eliminated if you fail to spell a word correctly.
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Final answer:
Silver and gold are two elements which have properties similar to copper. These common properties include sheen, malleability, ductility, and their ability to conduct heat and electricity, attributable to their similar atomic structures.
Explanation:
Two elements that have properties similar to copper, which is a metal, include silver (Ag) and gold (Au). All these elements fit into the same category - metals, that demonstrate certain characteristics:
- They appear shiny, and have the ability to be formed into different shapes (malleable) and drawn into wires (ductile).
- They act as good conductors of heat and electricity.
These properties stem from their similar atomic structures, placed in the same group on the periodic table.
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