Question

Moseley's assertions about the arrangement of elements actually_______mendeleevs earlier work on the periodic table.

a)discard
b)disproved
c)emphasized
d)supported

Answer 1

d)supported

Answer 2

ok thanks, i have more questions

Answer 3

you can ask
ask ur other questions on different threads

Answer 4

Why are the elements fluorine (F), chlorine (Cl), and bromine (Br) all found in the same group within the periodic table?

A) they all exist as gasses at room temp
B)they all react with the noble gases
C)they ave simular chemical properties
D)they are all nonmetals that frm 1+ ions

Answer 5

c

Answer 6

Using the periodic table, which of the following elements has the most properties in common with calcium (CA)?

A) potassium
B)magnesium
C)scandium
D)argon

Answer 7

b)magnesium bcoz it is in the grp of calcium.
u shud hv a look at periodic table urself too

Answer 8

thnx and i will :)

Answer 9

Group two in the periodic table contains the elements beryllium, magnesium, calcium, strontium, barium, and radium. What characteristics do these elements share?
A)they will tend to lose two electrons to become a 2+ion
B)they will tend to gain two electrons to become a 2-ion
C) they gain two protons to acheive a stable octet
C) they will bond in order to have an electron configuration like krypton

Answer 10

A

Answer 11

Define ionization and explain why the second ionization energy of any element is higher than its first ionization energy.

Answer 12

it is the amount of energy required to remove an electron from an atom.
after removing the first electron,the effective nuclear charge dominates by pulling the electrons more strongly.hence second ionisation energy is more than first

Answer 13

Based on their positions in the periodic table, which element would you expect to have the lowest first ionization energy?
A)fluorine
B)iodine
C)lithium
D)rubidium

And thankyou so muuch for helping me with this

Answer 14

rubidium

Answer 15

The valence electrons of the substance's atoms feel an effective nuclear charge of +7. if the unknown substance has lower ionization energies than chlorine, what other characteristics would you expect the substance to exhibit?

A.It would have larger atomic radii than Cl and a higher electronegativity value than Cl.

B. It would have larger atomic radii than Cl and a lower electronegativity value than Cl.

C. It would have smaller atomic radii than Cl and a higher electronegativity value than Cl.

D. It would have smaller atomic radii than Cl and a lower electronegativity value than Cl.

Answer 16

B

Answer 17

Which of the following atoms has seven valence electrons?

Chlorine
nitrogen
manganese
oxygen

Answer 18

chlorine

Answer 19

When one atom of carbon combines with four atoms of hydrogen, four nonpolar covalent bonds form, resulting in a molecule of methane. Which of the following describes the arrangment of valence electrons in a bond between C and H?
The valence electrons are shared equally between C and H.

The valence electrons spend more time around the atom of C.

The valence electrons spend more time around the atom of H.

The valence electrons are given up by the H and gained by the C.

Answer 20

second option

Answer 21

When nitrogen and tin (Sn4+) form an ionic compound, what is the formula?