Answer:
it has 3 valence electrons
Explanation:
2+2+1 is 5, boron is 5 and its in the 3rd group
II. All atoms of the same element are exactly alike.
III. Atoms of different elements are different.
IV. Atoms combine in specific numerical ratios to form compounds.
A. II only
B. II & III only
C. I & II only
(C) kinetic energy
(D) activation energy
(E) ionization energy
the minimum energy required for a nonspontaneous reaction
b. ivy growing around the pole of a fence
c. the angle of the sun changing during the day
d. outside temperature dropping at night
Given:
1,500 mL of water
1.33 m (molal solution
Required:
grams of hydrogen peroxide (H2O2
solution:
1.33 molal = 1.33 m = 1.33 moles H2O2/kg water
1 gram/liter of water (1 liter/1000 mL) (1500mL)(1 kg/1000g) = 0.0015 kg water
1.33 moles H2O2/kg water (0.0015 kg water) = 0.001995 moles H2O2
Molar mass of H2O2 = 34 g/mol
0.001995 moles H2O2 (34 g/mol) = 0.068 grams H2O2
To solve this we must be knowing each and every concept related to element. Therefore, "all of the noble gas elements except neon have 8 electrons in their outermost energy level" is a false element.
A chemical element represents a material that cannot be degraded chemically. Although chemical processes do not modify atoms, nuclear reactions can produce new elements.
Elements are classified according to the amount of protons they have. An element's atoms typically have the same amount of protons, but differing amounts of electrons or neutrons.
There are 118 recognized elements. Element 120.1 is being researched. When element 120 is created and validated, the periodic table must be updated to include it. A numerical subscript following an element in a chemical formula mean number of atoms. All of the noble gas elements except have 8 electrons in their outermost energy level.
Therefore, "all of the noble gas elements except neon have 8 electrons in their outermost energy level" is a false element.
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