Answer:
Explanation:
1) Valence electrons
2) Electrons
3) 2 electrons on K-shell
4) 8 electrons on L-Shell
5) 18 electrons on M-shell
6) nucleus
7) Proton
8) neutron
9) principal energy level
10) atomic number
11) symbol of the atom
12) name of the atom
13) atomic mass
Answer:
A and C represent elements while B and D represent Compounds
Explanation:
chemical elements cannot be broken down into simpler substances by any chemical reaction. While A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds
Answer:
B. calcium has electrons in more energy levels than magnesium
Explanation:
atoms are made of three types of subatomic particles - electrons, protons and neutrons.
Neutrons and protons reside in the nucleus of the atom and electrons reside in energy shells
electronic configuration for both Ca and Mg are as follows
Mg - 2,8,2
Ca - 2,8,8,2
outermost energy shell of Mg with electrons is the third energy level
whereas outermost energy shell of Ca with electrons is the fourth energy shell
therefore Ca has a larger atomic radius than Mg as it has one more energy shell than Mg in which electrons reside
Explanation:
I think there' will be a decrease in volume of the air.
Answer:
d.-379 cal/mol
Explanation:
ΔG = ΔG⁰ + RT ln K
for equilibrium ΔG = 0
ΔG⁰ + RT ln K =0
ΔG⁰ = - RT ln K
PG ⇒ PEP
K = [ PEP ] / [ PG ]
= .68 / .32
= 2.125
ΔG⁰ = - 1.987 x 273 x ln 2.125
= - 409 Cal / mole
Option d is the nearest answer .
