当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题七微点突破2金属性与非金属性电离能电负性比较

【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题七微点突破2金属性与非金属性电离能电负性比较

  • 2026-03-27 14:08:15
【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题七微点突破2金属性与非金属性电离能电负性比较

1.元素金属性、非金属性强弱定性判断

(1)比较元素的金属性

本质

元素原子越易失电子,元素的金属性越强

判断依据

单质与水或酸反应置换出H2越容易(反应越剧烈)

元素的金属性越强

最高价氧化物对应水化物(即氢氧化物)的碱性越强

单质的还原性越强(或对应阳离子的氧化性越弱)

一般来说在金属活动性顺序中位置越靠前

(2)比较元素的非金属性

本质

元素原子越易得电子,元素的非金属性越强

判断依据

单质与H2化合越容易,生成的简单气态氢化物越稳定

元素的非金属性越强

最高价氧化物对应水化物(即最高价含氧酸)的酸性越强

单质的氧化性越强(或对应阴离子的还原性越弱)

特别提醒只有最高价氧化物对应水化物的酸、碱性强弱才可用于比较元素非金属性和金属性强弱。

2.原子(离子)半径比较方法

(1)一看电子层数,最外层电子数相同时,电子层数越多半径越大,例如, r(Li)<r(Na)<r(K)<r(Rb)<r(Cs),r(O2-)<r(S2-)<r(Se2-)。

(2)二看核电荷数,电子层数相同时,核电荷数越小半径越大,例如,r(Na)>r(Mg)>r(Al),r(O2-)>r(F-)>r(Na+)>r(Mg2+)>r(Al3+)。

(3)三看电子数,核电荷数相同时,电子数越多半径越大,例如, r(Fe)>r(Fe2+)>r(Fe3+),r(Cl-)>r(Cl)。

3.元素的电离能

(1)1~36号元素的第一电离能(I1)变化规律

说明同周期元素从左到右,第一电离能呈增大趋势,第A、第A族反常;

同主族元素从上到下,第一电离能逐渐减小。

(2)应用

判断元素金属性的强弱

电离能越小,金属越容易失去电子,金属性越强;反之越弱。

判断元素的化合价

如果某元素的In+1In,则该元素的常见化合价为+n价,如钠元素I2I1,所以钠元素的常见化合价为+1价。

4.元素的电负性

(1)电负性是描述元素的原子在化合物中吸引电子能力的标度。元素的电负性越大,表示其原子在化合物中吸引电子的能力越强。

(2)变化规律:一般来说,同周期主族元素,从左到右电负性逐渐增大;同主族元素,从上到下电负性逐渐减小。

1.(2025·浙江6月选考,3)根据元素周期律推测,下列说法不正确的是(  )

A.原子半径:Mg>Na

B.电负性:C>Si

C.非金属性:Br>I

D.热稳定性:NH3>PH3

答案 A

解析同周期主族元素,从左往右原子半径依次减小,则原子半径:Mg     <Na,A< span>错误;CSi位于第A族,同主族元素从上到下电负性逐渐减小,则电负性:C>Si,B正确;BrI位于第A族,同主族元素从上到下非金属性逐渐减弱,则非金属性:Br>I,C正确;NP位于第A族,非金属性:N>P,故热稳定性:NH3>PH3,D正确。      </Na,A<>

2.(2025·浙江1月选考,4)根据元素周期律,下列说法不正确的是(  )

A.第一电离能:N>O>S

B.化合物中键的极性:SiCl4>PCl3

C.碱性:LiOH>KOH

D.化合物中离子键百分数:MgO>Al2O3

答案 C

解析同一周期从左往右元素的第一电离能呈增大趋势,但第AA族反常,故第一电离能:N>O>S,A正确;同一周期从左往右元素的电负性依次增大,电负性:Si     <P<Cl< span>,电负性差值越大,键的极性越大,故化合物中键的极性:SiCl4>PCl3,B正确;同一主族从上往下元素的金属性依次增大,金属性:Li       <K< span>,故碱性:LiOH         <KOH,C< span>错误;电负性:Mg           <Al< span>,故MgO的电负性差值>AlO的电负性差值,电负性差值越大离子键百分数越大,故化合物中离子键百分数:MgO>Al2O3,D正确。</Al<>          </KOH,C<>        </K<>      </P<Cl<>

3.(2023·天津,11)下表列出25 时不同羧酸的pKa(即-lg Ka)。根据表中的数据推测,结论正确的是(  )

羧酸

CH3COOH

CH2FCOOH

CH2ClCOOH

CH2BrCOOH

pKa

4.76

2.59

2.87

2.90

A.酸性强弱:CH2ICOOH>CH2BrCOOH

B.对键合电子的吸引能力强弱:F     <Cl<Br< span>      </Cl<Br<>

C.25 时的pKa大小:CHF2COOH     <CH< span>2FCOOH      </CH<>

D.25 时0.1 mol·L-1溶液的碱性强弱:CH3COONa     <CH< span>2ClCOONa      </CH<>

答案 C

解析根据电负性:F>Cl>Br>I,CH2FCOOHCH2ClCOOHCH2BrCOOH的酸性逐渐减弱,则酸性:CH2ICOOH     <CH< span>2BrCOOH,A错误;电负性越大,对键合电子的吸引能力越强,电负性:F>Cl>Br,对键合电子的吸引能力强弱:F>Cl>Br,B错误;F是吸电子基团,F原子个数越多,吸电子能力越强,使得羧基中OH极性增强,更易电离,酸性增强,则25时的pKa大小:CHF2COOH       <CH< span>2FCOOH,C正确;根据pKa知,相同浓度下酸性:CH3COOH         <CH< span>2ClCOOH,酸性越强,其对应盐的水解程度越弱,碱性越弱,则相同浓度下碱性:CH2ClCOONa           <CH< span>3COONa,D错误。            </CH<>          </CH<>        </CH<>      </CH<>

4.[Zn(CN)4]2-含有配位键,其中参与配位的原子是(填碳原子氮原子),理由是。 

答案 碳原子 CN-中碳、氮原子都含有孤电子对,但碳原子的电负性比氮原子小,更易提供孤电子对形成配位键

5.NH3BH3分子中,与N原子相连的H呈正电性(Hδ+),与B原子相连的H呈负电性(Hδ-),电负性大小顺序是。 

答案 N>H>B

解析 NH3BH3分子中,与N原子相连的H呈正电性(Hδ+),与B原子相连的H呈负电性(Hδ-),说明N的电负性强于H,B的电负性弱于H,故电负性:N>H>B

通过网盘分享的文件:word讲义【更新联系:lymsummers】等2个文件

链接: https://pan.baidu.com/s/10SY5y2aMVnchrA2xx-JUuQ?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000414s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000578s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004116s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000250s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000435s ]
  6. SELECT * FROM `set` [ RunTime:0.000190s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 462555 LIMIT 1 [ RunTime:0.000612s ]
  9. UPDATE `article` SET `lasttime` = 1774758953 WHERE `id` = 462555 [ RunTime:0.001862s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000333s ]
  11. SELECT * FROM `article` WHERE `id` < 462555 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000636s ]
  12. SELECT * FROM `article` WHERE `id` > 462555 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001874s ]
  13. SELECT * FROM `article` WHERE `id` < 462555 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000786s ]
  14. SELECT * FROM `article` WHERE `id` < 462555 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000751s ]
  15. SELECT * FROM `article` WHERE `id` < 462555 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000891s ]
0.082770s