Which of these elements is a transition metal? francium (Fr) beryllium (Be) chromium (Cr) gallium (Ga) bismuth (Bi)

Chemistry

2 answers:

coldgirl [10]3 years ago

8 0

The element that is the transition metal is Cr or chromium

klemol [59]3 years ago

8 0

Answer:

Chromium (Cr) is a transition metal

Explanation:

Transition metals are a series of elements present in the center of the periodic table. They are also referred to as the 'd-block' elements as it is the d-orbital that gets progressively filled with electrons with the increase in atomic number.

Based on the given examples:

1) Francium (Fr) is an alkali metal: group 1

2) Beryllium (Be) is an alkaline earth metal: group 2

3) Chromium (Cr) is a transition metal : group 6

4) Gallium (Ga) is a post-transition metal: group 13

5) Bismuth (Bi) is also a post-transition metal: group 15

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Which compounds are lewis bases? select all that apply. h―c≡c―h h− nh3 ch3ch2ch3?

Alisiya [41]

The Lewis bases are those which can donate electron pair to an acceptor. These electrons can be a pair of electron that is a lone pair, a negative charge or electrons in a $\pi$ -bond.

In $H-C\equiv C-H$ , the presence of $\pi$ -bond make it a Lewis base.
In $H^{-}$ , the presence of negative charge makes it a Lewis base.
In $NH_3$ , the presence of lone pair on nitrogen makes it a Lewis base.
In $CH_3CH_2CH_3$ , there is no lone pair, no $\pi$ -bond, no negative charge so it is not a Lewis base.