An element Y has the proton number 18.The next element in the Periodic Table is an element Z.Which statement is correct?
Element Z has one more electron in its outer shell than element Y.
Element Z has one more electron shell than element Y.
Element Z is in the same group of the Periodic Table as element Y.
Element Z is in the same period of the Periodic Table as element Y.
Which atom has twice as many neutrons as protons?
Which statements comparing the properties of electrons, neutrons and protons are correct?
a
b
c
d
Which row gives the number of electrons in the outer electron shell of fluorine and of neon?
a
b
c
d
The nucleon number of an isotope of rubidium is 85.How many protons, neutrons and electrons are present in an atom of this isotope?
a
b
c
d
An atom of X contains 13 protons and 13 neutrons.
An atom of X contains 27 protons and 13 electrons.
X forms an ion by gaining electrons.
X is placed in Group III of the Periodic Table.
a
b
c
d
Element X has 7 protons.Element Y has 8 more protons than X.Which statement about element Y is correct?
Y has more electron shells than X.
Y has more electrons in its outer shell than X.
Y is in a different group of the Periodic Table from X.
Y is in the same period of the Periodic Table as X
1,2and,3
1,2
1,3
2,3
Which pair of atoms are isotopes?
w and x
w and y
x and y
y and z
a
b
c
d