Answer:
- <u><em>Option C) Fr (francium)</em></u>
Explanation:
<em>Fluorine (F) </em>is not a metal; thus, the last option is discarded quickly.
The<em> most reactive metals</em> are the alkali metals, group 1 of the periodic table, because they have just one valence electron, which they can release more easily than other metals which have more valence electrons.
<em>Lithium(Li)</em> and <em>francium (Fr)</em> are alkali metals, while <em>aluminum (Al)</em> belongs to group 13, which means that it has 3 valence electrons.
Thus, aluminum is out of race too.
Lithium is in the second period (row 2 of the periodic table) while francium is in the last period (row 7).
The reactivity of metals in a group increases from top to bottom, because the valence electrons are shielded by many electrons (which are in the orbitals of less energy and closer to the nucleus of the atom), meaning that the valence eletrons can be released more easily.
Hence, the most reactive metal from the list is Fr (francium), option C).
The outer electron in magnesium is excited by absorbing the heat energy from the N=1 stage to higher energy levels when it starts to drop back down to the N=2 level it losses energy in the form of visible light this is part of the Balmer series
hope that helps
Answer:
Explanation:
Hello.
In this case, for the reaction between aqueous solutions of ammonium chloride and iron (III) hydroxide, we have the following complete molecular reaction:
And the full ionic equation, taking into account that the iron (III) hydroxide cannot be dissolved as it is insoluble in water:
Finally, the net ionic equation, considering that spectator ions are NH₄⁺, Cl⁻ as they are both the left and right side, therefore, the net ionic equation is:
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Answer:
A chemical change occurred and a gas was produced.
Step-by-step explanation:
If there is no chemical reaction, the <em>Law of Conservation of Mass</em> says that
Total mass = Mass 1 + Mass 2
However, if the two liquids react and give off a gas, then
Total mass = Mass 1 + Mass 2 + Mass of gas
You are not measuring the mass of the gas, so the mass of the liquids after mixing is less than it was before mixing.
For example, if Liquid 1 was a solution of HCl and Liquid 2 was a solution of Na₂CO₃, they would give off CO₂ on mixing. but you would not be measuring the mass of the CO₂.
Answer:
The atomic mass of the other isotope = 106.905 amu
Explanation:
Step 1: Data given
Atomic mass of silver = 107.868 amu
Ag109 isotope has an atomic mass of 108.905 amu = 48.16 %
Step 2: Calculate the abundance of the other isotope
100.0 % - 48.6 % = 51.84 %
107.868 = 0.4816*108.905 + 0.5184*X
55.419352 = 0.5184X
X = 106.905
The atomic mass of the other isotope = 106.905 amu