20. Would be the right answer
<span>iron gets hotter before copper.</span>
Answer:
See explanation
Explanation:
The electron configuration of an atom in an element determines the property of the atom. The core electrons are found inside the atom while the valence electrons are found on the outermost shell of the atom.
For cobalt, the outermost shell electron configuration is; [Ar] 3d7 4s2. The 3d7 and 4s2 are found in the valence shell of cobalt.
For arsenic, the electronic configuration is [Ar] 3d¹⁰ 4s² 4p³. The valence electrons are 4s2, 4p3. The 3d electrons are found inside the arsenic atom.
Answer:
Significant Figures
Explanation:
1) Annotation category: ...
2)RULES FOR SIGNIFICANT FIGURES.
3) All non-zero numbers ARE significant. ...
4)Zeros between two non-zero digits ARE significant. ...
5)Leading zeros are NOT significant. ...
6)Trailing zeros to the right of the decimal ARE significant. ...
7)Trailing zeros in a whole number with the decimal shown ARE significant. 8) to make you happy :) hope this helps you :)
C.
Protons is 8 so the atomic number will be 8.
Number of neutrons= atomic mass - atomic number
16-8 = 8.
