Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.

So simply 11+12 =23

6 0

2 years ago

How many moles are 5.55 x 102 atoms of Mg? M2) an> NU X 02.0

cupoosta [38]

Explanation:

number of atoms = moles × avegadro number

so 5.55 × 10^2 = moles × 6.023 × 10^23

moles = 5.55 × 10^2 ÷ 6.023 × 10^23 = 9.214×10−22 moles

4 0

3 years ago

When the volume of a gas is changed from 3.6 L to 15.5 L, the temperature will change from ______ C to 87 C.

harkovskaia [24]

V1/T1=V2/T2
(15.5)/(360K)=(3.6)/(T2)
T2=83.61290K
T2=-189.3871 degrees Celsius

5 0

3 years ago

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A neutral atom possesses an atomic number of 15 and an atomic mass of 31. Three electrons are gained. What is the result of this

Katyanochek1 [597]

Answer: an anion will form with -3 charge.

Explanation;

The atomic number of the given atom = 15

Atomic number = number of protons

The number of protons of the given atom = 15

The atomic mass of the given atom = 31

Atomic mass = number of protons + number of neutrons

Hence,

number of neutrons = atomic mass - number of protons

= 31 - 15

= 16

Since, the atomic number is 15, the given atom is P which has the atomic number as 15.

In the neutral compound,

number of protons = number of electrons

Hence,

the number of electrons of the neutral atom = 15

But, the atom has gained 3 electrons.

Gaining of electrons will form anions.

Hence, the atom will be converted into anion which has -3 charge on it.

But the atomic mass, atomic number, number of protons and number of electrons will not be changed

6 0

3 years ago

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