According to the periodic table, a sodium atom forms ion by losing two electrons correctly describes the change from a neutral atom of an element to its ion.
What is a neutral atom?
A neutral atom is an atom where the charges of the electrons and the protons balance.
Atomic number 11.
Mass number 23.
Na Electron arrangement 2, 8 , 1 Will lose 1 electron to gain a full valence shell.
Since now 11 + and 10 –, the overall charge is 1+ So we write or simply .
Learn more about the neutral atom here:
#SPJ2
(2) hydroxide ions as the only positive ions
(3) hydronium ions as the only negative ions
(4) hydronium ions as the only positive ions
Answer: Option (1) is the correct answer.
Explanation:
Sodium hydroxide is a strong base and when it is dissolved in water it completely dissociates into ions.
The chemical equation for this dissociation is as follows.
Therefore, we can see that sodium ions are the only positive ions and hydroxide ions are the only negative ions formed upon dissociation of NaOH in water.
Thus, we can conclude that the compound NaOH(s) dissolves in water to yield hydroxide ions as the only negative ions.
Answer:
Taiga
Explanation:
report the answer to the
appropriate number of
significant figures.
1204.2 +4.79613 = [ ? ]
This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:
In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.
In the case of additions, we perform the normal operation as the first step:
1204.2 +4.79613 = 1208.99613
Next, we round the result to the leastnumber of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the onlydecimalplace:
1209.0
Learn more about significant figures: brainly.com/question/11904364
its Kr on edg. i just took the pretest
Answer: grams
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.
To calculate the moles, we use the equation:
Now 1 mole of gas weighs = 28 grams
of gas weighs = grams
Thus the mass will be grams.
Hey there!
Molar mass N2 = 28.01 g/mol
Therefore:
28.01 g N2 -------------- 6.02*10²² molecules N2
( mass N2 ?? ) ----------- 25,000 molecules N2
mass N2 = ( 25,000 * 28.01 ) / ( 6.02*10²³ )
mass N2 = 700250 / 6.02*10²³
mass N2 = 1.163*10⁻¹⁸ g
Hope that helps!