Give the main features of f-block elements.

Decide which element has the greater size and defend your answer: (i) B or Si; (ii) C or P

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Which of the following atoms will have a larger ionization energy than arsenic? Kr Sb As1- Ge

Based on the ionization energies of the alkali metals, which alkali metal would you expect to undergo the most exothermic reaction with chlorine gas? Express your answer as a chemical symbol. О Ва О Ве O Cs оооо

which is the element with the lowest elecronegativity? WHICH OF THIS ANSWER IS CORRECT. A)  Francium b)helium c)neon d)lithium

The first ionization energy shows an overall increase from left to right across a period as shown in the diagram below for 2nd period elements. 2nd period 2100 1700 S 1300 900 A. 500 A Li Be B C NO F Ne a) Define the first ionization energy a) Why the first ionization energy of boron (B) is less than that of beryllium (Be) and why the first ionization energy of oxygen (O) is less than that of nitrogen (N)? Explain 1st ionization energy /kJ mol

Which of the following elements has the smallest atomic radius? carbon lithium boron oxygen

The periodic table lists all known elements arranged by atomic number. Atomic number is the nuclear charge, the number of protons in the nucleus of an an atom of a particular element. For a neutral atom, the number of protons is equal to the number of electrons. Each column of the table, called a group, contains elements with the same number of valence electrons that are in different quantum levels. Each row of the table, called a period, contains elements with differing numbers of valence electrons that are in the same principal quantum level. The four main blocks of the table (s, p, d, and f) contain elements whose highest energy electrons have the same azimuthal quantum number (ℓ).

What is the neutral atom that has its first two energy levels filled, has 1 electron in its third energy level, and has no other electrons? Enter the name of the element, not the abbreviation.