14.00
29.00
28.11
28.00
Correct answer is C
(\(\frac{92}{100}\) x 28) + (\(\frac{5}{100}\) x 29) + (\(\frac{3}{100}\) x 30) = 28.11
\(\gamma\)- rays
\(\alpha\)- particles
X-rays
\(\beta\) - particles
Correct answer is C
No explanation has been provided for this answer.
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
27, 33 and 33
33, 27 and 27
27, 33, and 27
60, 33 and 60
Correct answer is C
No explanation has been provided for this answer.
metallic
covalent
co-ordinate
ionic
Correct answer is D
No explanation has been provided for this answer.
Beryllium and aluminum have similar properties because they?
are both metals
belong to the same group
belong to the same period
are positioned diagonally to each other
Correct answer is D
At the beginning of periods 2 and 3 of the Periodic Table, there are several cases where an element at the top of one group has some similarities with an element in the next group. For example, boron is a non-metal with some properties rather like silicon. Unlike the rest of Group 2, beryllium has some properties resembling aluminium. And lithium has some properties which differ from the other elements in Group 1, and in some ways resembles magnesium. There is said to be a diagonal relationship between these elements. There are several reasons for this, but each depends on the way atomic properties like electronegativity vary around the Periodic Table.