Can someone please help?

How can I tell how many neutrons there are in an element

icang [17]

It all depends on if you know the mass number and atomic number then you will be able to find out what the amount of neutron in an element.

7 0

3 years ago

Which of the following diatomic molecules is joined by a triple covalent bond?

aivan3 [116]

The correct answer is C. In the periodic table nitrogen has 5 valence electrons and needs 3 more electrons to obtain an octet. So it would form three covalent bonds with another nitrogen and that would be a triple bond.

A is incorrect because oxygen is in group 6 and only needs 2 electrons to achieve an octet. So it would form two covalent bonds with the other oxygen to give a double bond.

B is incorrect because Cl is in group 7 and only needs 1 electron to achieve an octet. So it forms a single bond with the other Cl atom.

D is incorrect because helium is in Group 8, a noble gas, which means its valence shell is completely filled, hence no bonding can occur.

5 0

3 years ago

How do I balance these equations

Svet_ta [14]

Easy you can't touch the subscripts so u need to add coiffents like a puzzle if you do this then it will chance this 1st name each element on each side then say how much it's worth then see what you need to chance like this
Ti=1
Cl=4
Mg=1.
On the other side

Ti=1
Mg=1
Cl=2. What do you need to change using coffients

8 0

3 years ago

Identify the power of ten that defines each of these prefixes. Input your answers as 10 x where x is the power of ten. nano- ___

Gemiola [76]

Answer: The quantity of every prefix is written below as a power of ten.

Explanation:

In the metric system of measurement, the name of multiples and subdivision of any unit is done by combining the name of the unit with the prefixes.

For Example: deka, hecto and kilo means 10, 100 and 1000 respectively. Deci, centi and milli means one-tenth, one-hundredth, and one-thousandth respectively.

The quantity of these prefixes are written as the power of 10.

For the given prefixes:

Nano: The quantity will be $10^{-9}$

Kilo: The quantity will be $10^3$

Centi: The quantity will be $10^{-2}$

Micro: The quantity will be $10^{-6}$

Milli: The quantity will be $10^{-3}$

Mega: The quantity will be $10^6$

Hence, the quantity of every prefix is written above as a power of ten.

7 0

4 years ago

Calculate the nuclear binding energy for 5525mn in megaelectronvolts per nucleon (mev/nucleon).

r-ruslan [8.4K]

To solve this question, let us first calculate how much all the nucleons will weigh when they are apart, that is:
Mass of 25 protons = 25(1.0073) = 25.1825 amu 

Mass of neutrons = (55-25)(1.0087) = 30.261 amu

So, total mass of nucleons = 30.261+25.1825 = 55.4435 amu

Now we subtract the mass of nucleons and mass of the Mn nucleus:
55.4435 - 54.938 = 0.5055 amu

This difference in mass is what we call as the mass defect of a nucleus. Now we calculate the binding energy using the formula:

E=mc^2 

But first convert mass defect in units of SI (kg):
Δm = 0.5055 amu = (0.5055) / (6.022x10^26)
Δm = 8.3942x10^-28 kg

Now applying the formula,
E=Δm c^2
E=(8.3942x10^-28)(3x10^8)^2
E=7.55x10^-11 J

Convert energy from Joules to mev then divide by total number of nucleons (55):

E = 7.55x10^-11 J * (6.242x10^12 mev / 1 J) / 55 nucleons

E = 8.57 mev / nucleon

8 0

4 years ago