Answer:
Sr<Ca<Be
Explanation:
Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.
Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.
So, an increasing order of ionization energy is Sr<Ca<Be
mark brainliest:)
Answer:
an alloy is a mixture of elements that has metallic properties
Explanation:
Take the number of the exponent and move the decimal that many places. If it is positive move it left and if it is negative move it right.
For Example:
2.57x10³= 2570
Fill in any access spaces with zero.
Taking that same number to the negative 3 power
2.57x10^-3
0.00257
I put a 0. to show it is a distinctive decimal.
Answer:
X is an electron and Y is a proton.
Explanation:
The particle X caries negative charge it means it have one extra electron.
When number of electrons becomes greater than protons particle have negative charge and
Particle Y attract particle X it means Y has positive charge because opposite charges attract each other and it must be a proton because proton has positive charge while neutron is neutral.
Symbol and charge of proton= P+
Symbol and charge of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
Symbol and charge on electron = e-
Mass= 9.10938356×10-31 Kg
