Plllzzz plz plz plz plz plz match the element with its number of valence electrons. match term definition boron a) 1 carbon b) 7 fluorine c) 3 sodium d) 4 question 2 (fill-in-the-blank worth 2 points) (03.03 lc)  the element oxygen has valence electrons. (input only a whole number, such as 7.) numerical answers expected! answer for blank 1: question 3 (true/false worth 2 points) (03.03 lc)  sodium has more valence electrons than magnesium. true false question 4(multiple choice worth 2 points) (03.03 mc)  element a has seven valence electrons. how does its reactivity compare to that of element b, which has four valence electrons? element a is more reactive. element a is less reactive.

For 1: Boron has 3 valence electrons, Carbon has 4 valence electrons, Fluorine has 7 valence electrons and Sodium has 1 valence electron.

For 2: The correct answer is 6.

For 3: The correct answer is False.

For 4: The correct answer is Element A is more reactive.

Explanation:

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. The outermost shell has the highest number of principle quantum number, 'n'.

Boron is the 5th element of the periodic table having electronic configuration of

Number of valence electrons in Boron = 2 + 1 = 3

Carbon is the 6th element of the periodic table having electronic configuration of

Number of valence electrons in carbon = 2 + 2 = 4

Fluorine is the 9th element of the periodic table having electronic configuration of

Number of valence electrons in fluorine = 2 + 5 = 7

Sodium is the 11th element of the periodic table having electronic configuration of

Number of valence electrons in sodium = 1

Hence, boron has 3 valence electrons, Carbon has 4 valence electrons, Fluorine has 7 valence electrons and Sodium has 1 valence electron.

Oxygen is the 8th element of the periodic table having electronic configuration of

Number of valence electrons in carbon = 2 + 4 = 6

Hence, the correct answer is 6.

Sodium is the 11th element of the periodic table having electronic configuration of

Number of valence electrons in sodium = 1

Magnesium is the 12th element of the periodic table having electronic configuration of

Number of valence electrons in magnesium = 2

Hence, the correct answer is False.

Chemical reactivity is defined as the tendency of an element to loose of gain electrons.

We are given:

Element A has 7 valence electrons and Element B has 4 valence electrons.

Element A require 1 electron to complete its octet and Element B require 4 electrons.

So, it is easy for element A to attain 1 electron than for element B to even loose or gain 4 electrons.

Hence, the correct answer is Element A is more reactive.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este