24 Answered Questions for the topic Periodic Table

11/17/19

Why does Kr have larger radius than Ar when Kr has a larger effective nuclear charge?

Looking at the atomic radius trend of the periodic table, Kr has a larger radius than Ar. But my textbook claims that Kr has a larger effective nuclear charge than Ar for n=3. Wouldn't that mean Kr... more

09/17/19

Elements sharing valence electrons

I would like to know why it is that when elements share valence electrons, unless the elements are nonpolar, one element gets more time with the valence electrons.

07/27/18

please answer

which has higher ionisation enthalpy and why Be+ and Be

07/27/18

please answer

how many of following have greater z-effective than silicon atom   Na,Mg,Al,P,Cl,S,N,O,C,F

07/02/18

Physical Science Math

Bismuth and fluorine react to form bismuth fluoride. If 417.96 g of bismuth reacts completely with 113.99 g of fluorine, how many grams of bismuth fluoride are formed?

03/29/18

oxygen and sulfur are in the same group

 plese help me with this

11/15/17

what is the empirical formula?

the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?

11/14/17

determine the mass of each sample

1.16 mmol carbon disulfide

07/18/17

Periodic Elements related doubt

why are the 4 elements in the periodic table have not been found?

07/18/17

Periodic Elements related doubt

why are the 4 elements in the periodic table have not been found?

11/15/16

Periodic Table related doubts

If the ionic radii of each K+ and F– are 1.34Å, then the atomic radii for K and F will be

10/30/16

List an element that fits in each of the following groups.

Halogen = Alkali metal =  Lanthanide series = Transition metal = Chalogen = Noble gas = Alkaline Earth metal = Actinide series =

10/22/16

How are potassium-39, potassium-40, and potassium-41 different from each other? Write the isotope symbol for each?

How are potassium-39, potassium-40, and potassium-41 different from each other? Write the isotope symbol for each?

10/11/16

The ionisationenergy and electron affinity of an element are 13.0eV and 3.8eV Its electronegativity??

here are the options  2.8 3.0 3.5 4.0 please do show the steps to solve the problem too...

01/12/16

Why is the 2nd ionization energy of Aluminum higher than that of Silicon?

According to the ionization energy periodic table trend, silicon's should be higher but its. 

10/02/15

Why does electronegativity increase as effective neutral charge increases?

I know that electronegativity is the ability to attract shared electrons and that effective neutral charge is the pull of the nucleus on outer electrons based on my notes. But I'm not really sure... more

09/22/15

Ionic Size

I really don't understand what this is asking... please help.   1.) As you move left to right across the period, there are two elements that instead show a decrease in ionization energy. Identify... more

09/20/15

To which group in the periodic table does element M belong?

A certain element M is a main group metal that reacts with chlorine to give a compound with the chemical formula MCl2 and oxygen to give the compound MO. To which group in the periodic table does... more

07/11/15

How do I calculate the number of protons and neutrons for a fictitious element when only given the atomic weight?

I have a list of fictitious elements to put into a periodic table (of my own design).  I have the atomic weight, physical state (gas, diatomic gas, hard brittle solid, ,hard w/high melting point,... more

05/22/15

which list of elements contains only metal?

- helium, carbon, gold - sodium, chromium, copper - iodine, iron, nickel -phosphorous, nitrogen, oxygen

05/20/15

as you move left to right across a period does what does the number of valence electrons do?

 -increases -stays the same -decreases -increase & then decrease 

03/03/15

Within a period, what happens to the atomic radius as the atomic nuber increases? Why?

My super intelligent chemistry teach told me that my answer could NOT have directions in it or else no exception s and it will absolutely be mark wrong and this question is worth more than half of... more

01/05/14

how to complete a table using f(x) = ^2

I do not understand how to complete this table.  Would you show me how to get started.  thanks     f(x) = x^2                       x   =    0               + 1               ... more

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