Can you help answer #10 please?
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Subscripts are the small numbers (sub) that you see after the element letters. In H2, the subscript is 2.
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At STP fluroine is a gas and iodine is a solid, this observation can be explained by the fact fluroine has a .. ?a. weaker intermolecular forces of attraction than iodine b. stronger intermolecular forces than iodine c. lower average kinetic energy than iodine d. higher average kinetic energy than iodine
Are the following Mineral or Ore?
How does water help cells keep an even temperature despite temperature changes inthe environment?
Natural gas, or methane, is an important fuel. Combustion of one mole of methane releases 802.3 kilojoules of energy. How much energy does that represent in kilocalories?
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Answer: The reactivity of a metal depends on how easily it loses electrons
The reactivity of metals is due to the difference in stability of their electron configurations as atoms and as ions. As they are all metals they will form positive ions when they react.
the atomic theory
elements
the periodic table
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He is a Russian chemist and inventor who formulated the periodic law and created the periodic table of elements. He corrected some of the properties of the elements. Now, we can easily locate the elements we wanted to identify. With the help of Mendeleev, studying chemistry is not that difficult because he tried to simplify some of the concept that was complex before.
(2) lead (Pb) (4) chlorine (Cl)
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Answer: Option (1) and (2) are correct.
Explanation:
Elements which contain same number of valence electrons tend to show similar chemical properties. This is because having same number of valence electrons will make the atoms to react in a similar way.
For example, Silicon is a group 14 element. So, it contains only 4 valence electrons. Similarly, germanium and lead are group 14 elements and it has 4 valence electrons.
Therefore, silicon, germanium, and lead will have similar chemical properties.
Whereas phosphorous is a group 15 element, and chlorine is a group 17 element.
Thus, we can conclude that out of the given options germanium and lead elements has physical and chemical properties most similar to silicon (Si).
1. Germanium
2. Lead
3. Phosphorus
4. Chlorine
The elements in the same column as the element you have are the most similar. The rows are not. For example, though chlorine and magnesium are in the same row, they have very different properties, whereas chlorine and fluorine more similar
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Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.
Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.
When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.
One sodium and fluorine each totaling 2 atoms are enough to make the bond.
As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.
The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.
The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.
The name of the compound is sodium fluoride with formula NaF.
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