A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. which is the symbol of this nuclide?

QUESTION POSTED AT 14/02/2020 - 11:35 AM

Answered by admin AT 14/02/2020 - 11:35 AM

Answer: The nuclide is _{19}^{40}\textrm{K}

Explanation:

A radioactive sample is written in the form _Z^A\textrm{X}

where, X denotes the symbol of element.

Z denotes the atomic number of the element

A denotes the atomic mass of the element.

The element having atomic number 19 is potassium. The symbol of Potassium is "K"

Hence, the radioactive nuclide is _{19}^{40}\textrm{K}

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Related questions

What does the symbol ka mean in chemistry?

Ka is an equilibrium constant for the partial ionization of "weak" acids in water. If such a weak acid is HOAc, the ionization is 
HOAc = H+ + OAc- 
and Ka= [H+][OAc-]/[HOAc] 

Ka values range from about 10-2 to 10-14 Greater than 10-2, they are essentially strong acids, and below 10-14, they produce no more [H+] in water than would normally be observed.

ANSWERED AT 28/02/2020 - 05:13 PM


QUESTION POSTED AT 28/02/2020 - 05:13 PM

Classify this statement as always true, AT; sometimes true, ST; or never true, NT. To obtain a value for the number of moles using the ideal gas law, one uses the conditions of STP.

AT, STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density

ANSWERED AT 28/02/2020 - 05:11 PM


QUESTION POSTED AT 28/02/2020 - 05:11 PM

What is the molarity of a solution of kno3 (molecular mass = 101 that contains 404 grams of kno3 in 2.00 liters of solution? a 1.00 b 2.00 c 0.500 d 4.00?

(1 mol KNO3/ 101 g KNO3)(404 g KNO3)= 4 moles
D

ANSWERED AT 28/02/2020 - 04:37 PM


QUESTION POSTED AT 28/02/2020 - 04:37 PM

What is the chemical symbol for nitrogen and oxygen?

N2 and O2

hope it helps

ANSWERED AT 28/02/2020 - 04:26 PM


QUESTION POSTED AT 28/02/2020 - 04:26 PM

A certain vinegar is 6.02% acetic acid (hc2h3o2, by mass. how many grams of acetic acid are contained in a 355 ml bottle of vinegar. assume a density of 1.01 g/ml.

First, determine the amount of vinegar in grams by multiplying the volume by the density. That is,
                                        mass = (355 ml) x (1.01 g/mL) = 358.55 g
Then, multiply the calculated mass above by the decimal equivalent of the given percentage above. 
                      amount of acetic acid = (358.55 g)(0.0602) = 21.58 g

ANSWERED AT 28/02/2020 - 04:11 PM


QUESTION POSTED AT 28/02/2020 - 04:11 PM

Nuclear energy is produced when scientists force uranium (U) atoms to break apart. With this in mind, examine the list below. If scientists were to break apart each of the items on the list, which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter

Answer:

Compound.

Explanation:

A compound is a made up of two or more than two different elements. It can be broken down into smaller molecules.Elements are combined to form a compound by chemical bonding like ionic bonding and covalent bonding.

Different compounds of different elements can be broken down into the chemical reaction called decomposition reaction. For example:

Using electrolysis, we can break down water into its elements hydrogen and oxygen.    

ANSWERED AT 28/02/2020 - 04:06 PM


QUESTION POSTED AT 28/02/2020 - 04:06 PM

An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located? 1. 5 2. 2 3. 3 4. 4

Answer: The given element belongs to Period 4.

Explanation:

We are given:

Number of innermost electrons = 28

Number of outermost electrons = 7

Total number of electrons = 28 + 7 = 35

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

The electronic configuration of the element having atomic number '35' is:  1s^22s^22p^63s^23p^64s^23d^{10}4p^5

To identify the period, we look at the highest occupied principle quantum number which is 'n'. Here, the value of highest occupied shell or 'n' is 4.

Hence, the given element belongs to Period 4.

ANSWERED AT 28/02/2020 - 03:57 PM


QUESTION POSTED AT 28/02/2020 - 03:57 PM

The modern model of the atom used today is the Plum Pudding model. true or false

That would be false.

ANSWERED AT 28/02/2020 - 03:42 PM


QUESTION POSTED AT 28/02/2020 - 03:42 PM

Write the symbol for every chemical element that has atomic number less than 74 and atomic mass greater than 173.8u

You should be able to locate them on the periodic table as long as you know which part the atomic number is and which part the atomic mass is.

ANSWERED AT 28/02/2020 - 03:22 PM


QUESTION POSTED AT 28/02/2020 - 03:22 PM

A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?

The SI unit for amount of substance is the mole. It has the unit symbol mol. The proportionality constant is the inverse of the Avogadro constant. The mole is defined as the amount of substance that contains an equal number of elementary entities as there are atoms in 12g of the isotope carbon-12.

Hope This Helped! :3

ANSWERED AT 28/02/2020 - 02:51 PM


QUESTION POSTED AT 28/02/2020 - 02:51 PM

A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?

The 12C isotope.  Hope this helps.

ANSWERED AT 28/02/2020 - 02:51 PM


QUESTION POSTED AT 28/02/2020 - 02:51 PM

What type of reaction is radioactive decay? 1zero order 2first order 3second order 4third order

2. first order reaction
Hope I helped! :)

ANSWERED AT 28/02/2020 - 02:46 PM


QUESTION POSTED AT 28/02/2020 - 02:46 PM

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? a) 1.00 b) 18.0 c) 36.0 d) 324

Number of moles = Given Mass / Molar mass

Here, Given mass = 18 g
Molar mass = 18 g/mol

Substitute their values, 
n = 18/18
n = 1 mol

In short, Your Answer would be: Option A

Hope this helps!

ANSWERED AT 28/02/2020 - 12:46 PM


QUESTION POSTED AT 28/02/2020 - 12:46 PM

How many atoms in 1.06 g of Li

Well I know that the first step is to convert 14.3 grams to moles, so 14.3 multiplied by the molar mass of LiF divided by 1 is 0.55 moles. But where do I go after this? Do I just multiply 0.55 by Avogadro's number? thats it

ANSWERED AT 28/02/2020 - 12:18 PM


QUESTION POSTED AT 28/02/2020 - 12:18 PM

On number 5 I am really stuck can I have help please.

Answer to this question is absorbed

ANSWERED AT 28/02/2020 - 11:52 AM


QUESTION POSTED AT 28/02/2020 - 11:52 AM

Can someone please help me on number 4

That'd be C hun! Hope that helps!

ANSWERED AT 28/02/2020 - 11:51 AM


QUESTION POSTED AT 28/02/2020 - 11:51 AM

Can someone please help me on number 2 I am really stuck.

A longitudinal wave. I'm 100% sure.

Hope this helps!

ANSWERED AT 28/02/2020 - 11:48 AM


QUESTION POSTED AT 28/02/2020 - 11:48 AM

If a 40 kg person is accelerating at m/s^2,then the magnitude of force acting on him or her 400 N? true or false

 F = ma = 40kg * 10m/s^2 = 400 kg-m/s^2 = 400N

ANSWERED AT 28/02/2020 - 11:35 AM


QUESTION POSTED AT 28/02/2020 - 11:35 AM

Find the number of atoms of lead in 30.04 moles of leads

6248.32 is the answer 


ANSWERED AT 28/02/2020 - 11:30 AM


QUESTION POSTED AT 28/02/2020 - 11:30 AM

Find the number of atoms of arsenic in 28.62 moles of arsenic

The number of the atom would be half the numbers that is there 

ANSWERED AT 28/02/2020 - 11:28 AM


QUESTION POSTED AT 28/02/2020 - 11:28 AM

The requirements for one type of atom to substitute for another in a solid solution are:

Liquid gas solid and the gas

ANSWERED AT 28/02/2020 - 11:12 AM


QUESTION POSTED AT 28/02/2020 - 11:12 AM